I didn't - in fact I'm not sure that I know even now. Most of the stuff I've done I've done without prior experience. Figuring it out has been a process. I've tried to find people who know and ask lots of questions and taking lots of notes. If you can't find these people - go to an industry conference even if it costs $2,000 for a trip and don't be shy. Go meet people and learn from them. Most importantly - keep learning. If you have much success you'll probably start thinking "this isn't that hard"... when you get to that point you are probably about to hit a pretty rough patch.