Hi, So glad to see you are getting some good advice here! Wonderful.
Like some others, I took up clicker training for my U2 and my caique, and the training really shows you how to handle various situations because it teaches how you can reward the behaviors you want and remove the rewards from the behaviors you don't want.
As was said, your cockatoo will need to scream and flap every day. That's for the health of the bird. But you won't need to worry about attention screaming problems if you learn how to refrain from rewarding those behaviors.
You can read more about this at http://www.geocities.com/birdtrain
And you can join the list from there, too. There are about 600 members right now, though, so you might want to choose the digest format or choose "nomail" and read from the web site (they're at Yahoogroups).
More great info on operant conditioning is at: http://www.karenpryor.com/home/
And as an aside, HI TINA!! Nice to see you helping people out over here, as usual!!
All the best to you all,