You just play, and make a game saying am going to tickle you and you rub your hand under his wing very fast, just play. I have only one bird that will let me pull her wing out that's my cockatoo Lady. The others large birds its towel time, cover then snip the wings, be careful of blood feathers DO NOT CUT BLOOD FEATHERS!!!! ITS VERY PAINFULL FOR THEM.
Lol, welcome to parrots, yes they chew on everything everything is a toy for them.
I am so happy for you, it sounds like you are doing a great job in teaching him.
When I moved into my brand new house within two days, Lady decided to mark my wall, she did a great job removing the wall, lol it was my fault,so yes they love to chew. If he chews on something give him his toy, say no bite, here play with your toy.
You can go to the thirft store and buy baby toys, (clean them) and you will have some great toys for him, that he can play with outside his cage.