search this forum for this topic as someone recently did a very nice write-up with pictures on replacing the headlight switch on a TJ. i did this repair myself on my '02 a few months ago and it is a very easy job. as was said above just remove the two screws holding the black plastic steering wheel shroud, pull the shroud off the steering column and you will see the headlight switch screws (torx).
get a replacement switch from Autozone not the dealer, I made that mistake and threw away 60 bucks.
2002 Wrangler Sahara, all stock, 5-speed, Dana 44, duel tan tops, 2nd owner.
2008 Hemi Grand Cherokee Limited 4X4, Quadradrive II, original owner, 22,000 miles.