Well your bird may stay mild or it might hit it's terrible twos--like Ollie did. Ollie's always been a very active bird, but he didn't become nippy until about 4 months old. Prior to that as a baby he was mostly interested in begging for food. When he and his brother were getting close to being fully weaned they started playing more. Ollie was more out going than his sibling, who was quieter. We actually thought we were going to take the other Jardine, he was more mello and relaxed than Ollie--but towards the end of his weaning period, the other Jardine turned on us and didn't want anything to do with us. Ollie, on the other hand, always came running to me when we arrived for visits. So he's the parrot we ended up taking home. I don't know whether it was the other bird perfered female companions or what exactly the problem was, but the chemistry just wasn't right.
Ollie is a hard player, in fact he's been so rough tumbling off of things and falling from the top to the bottom of his cage that he has broken off all his tail feathers. He is molting slowly, I can't wait till he grows those tail feathers back, he looks a bit odd without them. Then, of course, I'll have to worry about him breaking the blood feathers off; but he's not as rough as he once was.