MrCavyMadness wrote:My parents don't mind the noise at all. They hate the smell and time of guinea pigs. Their cage cleanings take forever and since they're on fleece i have to spot clean everyday. My birds don't take me nearly that long and their cages are always clean. Thanks for your reply.
But, again, my guinea pigs will be gone in a year whether I like it or not, I just thought that If i got the hahns, I could have him a lot longer and won't have to rehome him. My parents love birds, not just cockatiels, and don't mind caring for them. Most of the time, Ill be home anyways. Then I'll move them up to school in an apartment with me when I can. Thanks for replying.. Im torn
If they don't like the idea of taking such a large amount of time caring for your guinea pigs and doing a lot of spot cleaning, then I think the novelty of taking care of a larger bird will quickly wear off. I spend a great deal of time doing spot-cleaning looking after my conure (who is about the size of a cockatiel) when she's out of her cage, and cleaning the area around her cage as well, and I'm not a super meticulous person. If I was more intense about keeping everything super clean, I would be sweeping and mopping every day, wiping down bird-related surfaces every day, spot-cleaning after my bird goes poop anywhere where she's outside of her cage, and probably doing a load of laundry every day.
A Hahn's macaw is going to require a lot more cleaning, because not only do they poop often (like any other bird), but their poops are going to be bigger than your cockatiel's. Also, (and you may or may not have noticed this with your cockatiel) parrots take great joy in throwing their food around. When you have a bird that eats predominantly fresh produce (as should be the case with birds), the food they throw around is going to start to smell relatively quickly, and is also going to stick to EVERYTHING. My bird gets a berry or two (typically raspberries or blackberries) out of a frozen mix I keep around to add to her grains and veggies every day, and the area around her cage quickly starts looking like a murder scene because bits of bright red berry and berry juice go everywhere.

Pajarita's right about the Hahn's macaw personality. They can be very nippy, and I'm sure your parents will quickly lose patience with a bird that regularly bites (especially when it can draw blood and, in the worst cases, result in the need for stitches). Cockatiels can't bite super hard (just hard enough to break skin, and maybe draw a little blood in extreme cases), and even though they can bite, they usually don't. When it comes to caring for cockatiels versus pretty much any other parrot in the pet trade, you're going to end up comparing apples to oranges.
Also, that sweet baby Hahn's macaw is eventually going to hit puberty, or otherwise start testing boundaries, and if you or your parents aren't prepared for the kind of commitment to training and socialization that parrots require, you are going to run into problems. My conure was clearly not well socialized by her previous owner when she was in the young and impressionable stage, and now every time my brother tries to handle her, she attempts to tear his fingers to shreds - I haven't been able to let strangers or neighbours try to handle her in any way at all yet. A lot of people don't understand that they have to expect parrots to bite and be prepared for it, and don't know that they shouldn't take it personally when it does happen. That's one of the major reasons why so many parrots end up in shelters.
Not to mention the level of destructiveness is exponentially larger in pretty much any bird other than a cockatiel. A Hahn's macaw will find ways to get into everything you don't want them to get into. Though the opportunities for sheer destruction are minimal in my current apartment, my GCC has already pulled at least one keyboard key off my laptop (and almost got another), tries to climb on and chew my laptop at every opportunity, and has left many scratches on my glasses - lenses and frames. A mini macaw is going to be capable of much more than that, being bigger and more powerful than the average GCC.
Also, school is going to take up a lot more time than you think, especially if you're in the sciences, because in addition to taking regular classes, you'll also have lab practicums to attend as part of your degree(s). I only graduated university this past May, and let me tell you, even if it had been possible for me to have pets while I was away at school, I do not regret waiting to make a commitment to giving a bird a permanent home. I was in no way equipped to give a parrot the kind of care it deserved, in terms of finances, time, or emotional capacity. I wasn't even really equipped to take care of the hermit crabs I briefly snuck into my dorm room, and ended up having to give them up after my first semester with them (turns out travelling with hermit crabs is a lot more difficult than you'd think).
I know it's frustrating to hear a lot of people tell you that the thing you really want right now is actually a bad idea. But take it from someone who isn't that much older or farther along in life than you - you absolutely will not regret waiting until you're done school to make this kind of commitment.
The thing is, in my short lifetime I have had 3 budgies, a cockatiel, and 6 chickens (technically my parents' hens, but I took care of most of their upkeep when I was home from university), and of those 10 birds only 1 has spent the entirety of their life in my home. 2 budgies, my cockatiel, and 3 of the chickens (the other 3 were stolen. Never found out who did it or why) had to be rehomed because I (or my parents) simply weren't capable of making the kind of commitment to them that they would have needed us to make, and we weren't equipped to provide for all of their needs. The reason I've chosen to commit to my GCC now is because I can afford to keep her, have the time to provide for her, and don't have to rely on my parents to help me care for her, which makes her my responsibility alone.
This sort of thing is why I am imploring you not to make such a massive commitment before you've even started university, let alone finished it. Most people wouldn't even think of getting married or having a child before they finished their schooling and for good reason - they aren't anywhere near prepared to make that kind of high-maintenance, lifelong commitment. As I like to say, a parrot is basically a jealous two year-old who can fly and has a power tool attached to their face, and will be that way for the next 20+ years. A Hahn's macaw is probably going to live for close to 40 years - are you really sure you're ready to live with a bird that is going to require careful dietary monitoring, consistent training, enrichment, and socialization, and CONSTANT cleaning for that long? If I'm totally honest, I don't think anyone is ready for that level of commitment when they're still in high school.
I hope you understand where I'm coming from with this. Regardless of what you ultimately decide, I and everyone else on this forum only want what is best for you and your bird(s).