Okay, I just got my new Enkeis yesterday. As I was takeing my old Rotas off, I noticed one of the lug nuts on my rear passenger wheel was wicked hard to take off. Well I finaly got it off, but with half of the lug still in the lug-nut. How do I go about replacing that lug? Is this an easy job? What will I need to do this?

I've never done this before and figured I'd ask before ripping it all appart.
Thanks, any help is much apreciated. I'll be on AIM later if you want to talk on that instead.