Buy a flea comb from the pet store. Wash and condition your hair and comb through it. Repeat about 2 more times. Make sure to comb your hair in sections and separate them to ensure that you get every piece of hair. Comb from scalp to the ends of your hair. This will remove any adult lice. You'll still have to keep doing this to make sure you get all the nits out.
My daughter had lice when she was in 2nd grade. We nix'd her 2 times and then kept up with the comb and eventually got all of nits out.
Make sure to kill the nits after they come off the comb. I think, but can't remember if I put them into rubbing alcohol or what.