[cypher]

Good to hear that Nugget is progressing & getting braver

If you lay your hand flat you may get an exploratory little nibble or two but that's not really like biting & if you keep your hand still with a treat maybe just on your fingers within easy reach to begin with he will most likely just take it, if he's ok with that then try the treats up on your palm & he will probably soon be climbing right onto your hand.
If he does bite just try not to react, move your hand away very slowly so you don't startle him & he should be fine.
If he's approaching your hand already then it's not that likely that he'll suddenly begin biting.