First thing you should do, is throw that snake hook in the trash. They can hurt the snake if not used properly and it's not like a juvie JCP can cause any real damage. They're almost all nippy when young, don't be concerned. Just handle often and they'll calm down by the time they hit yearling age if not sooner.

On a side note, make sure to offer only rats. Some carpets have problems with imprinting onto mice. I've personally never had a problem switching from mice to rats, but I've known others that have.