Hi there! Glad to see that you can provide a large cage for your bird, that's a good start

I have a Blue-headed Pionus, and have met a few other Pi's. As for the taming I don't know if it's particularly hard or easy, guess it depends on what you mean by "taming". My girl accepts anyone, she's extremely friendly. She's not the most cuddly though, she comes to me and my boyfriend for scritches, but she's not the type that would throw herself on her back, wanting to be scratched just anywhere. I guess one could say she has her integrity, but she's absolutely not shy, unfriendly or anything. She likes to sit on my shoulder and follow me around during the day, and if we have visitors she's quick to try and find out who they are. She's very social in that way!
She's not extremely playful, she doesn't initiate a lot of play on her own. If I "play" with something though, she's very interested in it. But she's not the clownish type that you can just sit down and watch for hours. If I just sit and watch her, she'll only play for a bit, then she just looks at me as if she wanted me to come up with something fun. So if you're looking for a bird to entertain you rather than a bird for you to entertain, I'm not sure if a Pionus is a good choice (I'm no expert, have only met mine and two others). The good thing about this is that her laid back attitude makes her less demanding, she lets me do other things (like laundry and studies) without going nuts.
She's not nippy, the only time she uses her beak is when preening me, or when she's playing (she never plays rough). Sometimes she decides to take a nap on our curtain rod in the living room (which I don't like because it's just above my boyfriend's speakers, he doesn't want poop on them), and when I go to pick her up and put her in her cage instead, she sometimes grabs my finger lightly with her beak, as if she was grumpy about me disturbing her slumber. But it's so light and happens so seldom I wouldn't call her nippy.
Mess? Yeah, guess all parrots are messy. She's a very messy eater, but aren't they all?

Not much dust though, which is nice!
Noise-wise she's very convenient, the only times she'll scream nowadays (she screamed a bit before she had settled in properly) is if she sees something very interesting through the window (happens maybe twice a week, tops) or if she gets scared/over-excited, which doesn't happen often either. Most of the time she's just making low sounds, like beak-grinding and some chirping. She's also making some other funny noises, although all of them are pretty low in volume.
She's not talking, and I've heard Pionuses in general aren't very great at this, although they sometimes learn a few words, and often speak with a robot-ish voice. She has learnt to wolf-whistle though, and in the mornings she flies to her training perch and sounds like the clicker, so she does mimick a little bit
Sweet - YES! The sweetest thing ever! She's so extremely kind and friendly, my heart just melts. I might be biased though, but really, if you want a sweet bird, I think a Pionus could be good, see if you can meet one and I hope you'll see what I mean. The three I've met have been super sweet
Pajarita also has Pionuses so maybe she can give you some input on these species, I also think CML has one.
Good luck with finding a parrot that suits your personality and life!
