Black throats get pretty darn big so I would say after a week or so start to hold your hand in the cage until he is calm enough to come up and examine your hand. You don't want to snag at them. They come to you when they are comfortable enough. I would try and feed him. He will likely take some sort of food. You want to put the food on a plate and leave it in there. You won't want him to associate your hands with food. I feed with tongs sometimes but I usually just drop the mice in and let him "find" them on his own. Good luck