[chapala]

First, if he's biting when on your shoulder, don't let him up there until he's learned not to bite. That's just asking for trouble. When he does bite your hand or anywhere else, immediately put him back in the cage for a 5 minute time out. Have a small dish towel ready if you need to pick him up so he can't bite your hands.

Sounds like you may need to go back a little bit on the amount of handling you're doing. The bird may not be ready for it, and biting is the reaction. You want to hand feed while the bird is in the cage, not picking him up for awhile, just getting him used to being rewarded for taking the food gently. If he bites, no reward, and leave. Step by step, he can learn that biting is not acceptable, and rewards come from not biting. Consistency is very important! Good luck with him!