Not sure about the 02, but on my 01 STS it's not too hard to get at any of the bulbs. Pop hood, remove the plastic cover, and there's a bracket on top of the headlamp assembly with two bolts to remove. Then you pull the assembly forward(may take a little force). From there you just twist each of the bulbs out of there place. The xenon one may be held in by a screw or two, can't remember. Just had to replace a balast last week and even that wasn't too bad.