Hi,
i have one male winter white dwarf, and he used to bite me in his cage for a month! It took ages to tame him (glove using...), about a month, to stop him from biting me out of the cage. Even now he sometimes likes to "taste" me when out of the cage, but its nothing like biting.
He does bite in cage still if i show him the finger, LOL (i think he imagines its food offering...). Also i read that a lot of them just want to get you of their teritory and are not biting when out of the cage.
Dont worry, even if he bites you really hard its not that painfull, especially when you are prepared. He never managed to draw blood out of my finger.
About the taming: try using the gloves, washing hands before handling and maybe surround yourself and the cage with some stuff they cant climb so that they dont escape (false bathtub
) and then try.
They are not that fast when out of the cage sometimes..because its all new and they are not sure of themselfs outside so much as in their teritory (the cage).
Good luck!