I think one of the tricks in slapping is to have patience enough to let your hands memorize what they're doing. If you can hit the string with your thumb, and pluck it with one of the others correctly - then you may only need to put the time in. If you can't can't get a sound I'm sure there's 1000 videos on youtube showing proper technique. This guy's slap bass program is worth every cent
http://www.youtube.com/watch?v=6tK_d...eature=related . Maybe you can find his beginning lessons in a search.
Anyhow - going really really slow with a metronome, at 40BPM if necessary just keep doing octaves, speeding up a beat or so every 5 minutes. If you concentrate on making it sound musical, and have patience you'll just wake up one day surprising the crap out of yourself. Your hands go into autopilot and you just start slappin away. There's more to learn than just the above mentioned octaves, but once you've got the technique down you can pick up all kinds of tricks and rhythms and just practice them the same way.
PS. I thought there was no way I could ever play slap bass, it eluded me also. A few years later I'm playing stuff like the first song on my myspace page below (faik). It's all slap. It's not Victor Wooten, but I'm havin just as much fun.
