Can anyone provide me with detailed info on how to replace the headlight bulbs for the 2002 xterra? I replaced it once, but my friend did it awhile back, so i'm in need of help.

First locate the battery dissconnected the negative lead just to be safe. Then locate the headlight lamps harness and dissconnect both of them .Now locate the white retainer rings for the headlight lamps. Unscrew them Counter clockwise. Casrefully remove the bulbs , it may take a little gently wiggling to break the seal that the O ring has made to the lamp housing. Now that the old headlight lamps are removed simply reverse this procedure being careful not to ever touch the glass envelope. Also do this on a dry low humidity day to avoid trapping moisture inside the lamp assembly. :) Your done