hi1 we had a tokay gecko lizzard training
hate to disapoint you but you better look into a nice heavy cow hide type glove! as they have very strong jaws and habbitts of latching on sometimes days, they are agressive little cutties and some do tame down but you will have to continue holding him a lot on a regular basis but be prepared
i had to take our cat at the time[yrs ago] to the vet to get ours pried off cats nose they sayd they may have to well you know asthey do rabies tests i told them to keep trying and pressing his head , massaging his chin worked thank god
would have been ugly you may also try vicks as this is used to train bitting cats but i would ask a raptile vet first dont wont him getting sick! if he gets loose look on your ceiling they love the chase up there