Rear Derailleur adjustment

There's some time of black magic behind adjusting the rear derailleur. It's as hard as trying to remember how "derailleur" is spelled!!! When I read some tips on adjusting it, it seems easy. About 30 minutes later, my chain is all over the place on the rear cassette.

Anyways, this seems like about the best article I've found so far. At least my chain shift through *most* of the gears now!!

http://www.parktool.com/repair/readhowto.asp?id=64

http://www.sheldonbrown.com/derailer-adjustment.html

http://garynuke.homestead.com/derailleur.html

*** After some more reading and monkeying around, I realized it isn't quite as hard as I thought... I just wasn't getting it for some reason at first...