Pre98:
Use a Straight Screw driver and pry behind the hvac trim (ac/heater trim). There are four clips that hold this piece on.
Post97:
There is four screws under the Radio, Use a Philips Screw driver to remove them, then the hvac trim should remove fairly easily, might require a bit of prying at the top, and pulling down on the bottom half in oder to get the stereo rest out.
Final Steps:
Once you remove it, unclip the dimmer switch. now user a Philips Screw driver to remove the screws holding the hvac panel in. The bulbs are now accessible, remove the wire harnesses to get to them eaiser. There are two bulbs.
Hopes this helps.