THIS PERIOD WILL END! I was in your situation just a few short months ago, and I was convinced that Tobi would use me as a chew toy forever..but rest assured that it ends.
One great way to show your fur kid that you will NOT tolerate this whole biting thing is by leaving them EVERY time they bite you. And when you leave them, leave them ALONE for a few minutes to show them that if they're going to play rough, that they will lose their play mate. It may not work right away at first, but as time goes on (and as long as you stay consistent and persistent), they'll catch on to the idea.
Also, for the time being, I recommend using the
Bitter Apple spray. Although some people may think it's not good to way to deter bad behaviour/the nibbling, I found it helped me. Try spraying the Bitter Apple on your fingers/hands and when they try to nibble they'll taste the yucky spray.
Best of luck to you!