Just a word of warning to you KimberlyAnn, and to you Nir, saying no is not going to help, it will serve as a reinforcer for the bite.
I did exactly what you did KimberlyAnn, only I said "no" as Nir rather than "soft":
I'm also thankful to hear someone else saying to not ignore bites. In the wild, I don't think other birds would ignore a bite! I tried the ignoring thing and it did not seem to do a bit of good. Saying "Soft" and putting the bird down has worked wonders. But we didn't have a big biting issue.
This resulted in the biting being reinforced and it evolved to a biting problem, that took months of blood and pain to overcome. Also, because I grabbed Stitch and put him down, he started to associate being grabbed as something negative and started biting when I tried picking him up.
This took even longer to fix, as it was heavily reinforced.
We did get there in the end, Stitch almost never bites and is fine with being picked up again, but it has taken lots and lots of time. So please, think your methods through.
I realise, and totally sympathise with the fact that you cant show no reaction at all when being bit by a big bird. But, there's a world of difference in removing your hand, and reinforcing it with sound, sudden moves, and grabbing (which can lead to the above described problems). Just remove your hand if a bite happens, but rather than letting them bite you, work with PREVENTION, dont put yourselvs in situations in which the biting will happen.
I think Pajaritas method of making a big ruckus and screaming CAW CAW CAW is better than saying no (as there is a clear difference in whats intended with the screaming, pajarita wants to establish herself as a bigger bird, whereas a regular no is you trying to teach your bird manners like you would a human child), but I am not sure its a method I would personally use myself.
Also, keeping the birds on a regular schedule is great, just as pajarita wrote. It doesnt have to be a SOLAR schedule though, you can keep your birds up later by modifying their environment.
Our parrot room's windows are covered with light proof blinds, and all lights are running on electrical timers.
Lights go on at 11am, and go out at 10pm - which is the time our parrots are awake. This allows for a constant day rhythm for the parrots, they have more time with us as they can stay up later, and they get 13 solid hours of sleep. Very easy to achieve with just a little work.