I have just recently got a kit and he is also my first ferret

I havent had too much trouble with him nipping, at first he was pretty bad but he seems to have settled well after taking the advice of the chap i got him from. He told me one of the best ways to train them was to scruff them, tell them no and then gently squeeze the cheeks into there mouths (if you can imagine squeezing your own cheeks while your mouth is open to make you look like a fish lol best way i could think to describe)

It worked a treat and after a week or two of persisting and not letting him get away with biting it worked!

Hope this helps, Hannah!