Go here, get the manual for your bike:
http://forums.sohc4.net/index.php?topic=426.0I just did mine, a couple hour job. Replace your seals, they're about 10$.
I'd watch out for stripping the 6mm allen head bolts at the bottom of the fork tubes, mine were crazy tight and rounded a little. Also, find something like a block of wood to keep the cap from rocketing into your face when you remove it - there is a spring under there.
Fork oil, 10 wt, is available at most cycle shops. You can use ATF if you can't find it.