hello i dont think he will stop nipping you some ferrets are very nippy i have a male who is a nipper and i handle them everyday but he still goes in for the kill and my god it hurts .
but my other 3 dont bite they do play bite if you play with them but its not rough.they love to kiss me as when i take them out i ask them for a kiss and they do its so cute.
all i can surgest is lots and lots of handling .good luck with him