As mentioned above, wearing an item for a few days then putting it in their tank is a good idea.
No matter what, always do whatever it is you planned to do. If you went in there to pick him up and he bites at you, still pick him up. Wear gloves if you don't feel comfortable. If he gets his way, he will think he has won and will only get meaner and nastier to prove his point.
Next find an area that's safe for him or make one. Some people will do this in the bathtub, some make playpens, etc. Put him in the bathtub and you go in there and sit with him. Let him get used to you and it'll help him get over himself. Plus, you'll be warmer than the bathtub so that's appealing for this little guy.