Invest in a Haynes manual. The labor to change $3 bulbs might be very high. I recently changed the bulbs in my Sentra SE-R and it wasn't that bad. In short, disconnect the speedometer cable from the transmission (this will allow you to pull the gage cluster far enough out to get to the bulbs. Remove screws from the bezel around the gage cluster, remoe bezel, remove screws from gage cluster and pull far enough from dash to access bulbs.
Again, a Haynes or Chilton manual will help for the items particular to you vehicle.
I plan to take it in to the dealer for replacement. Does anyone know how much is involved in replacing the light bulbs? It would appear to be quite labor intensive.