I posted this in another thread but i thought it'd be good to post it here too. Might take away some of the intimidation you might feel from reading the "tricking bible".
Well the class A tricks are the hardest to learn by far. All the tricks after them are basically variations and combinations of the class A tricks so once you get the basics down your progression becomes much easier.
Don't let this scare you off though, once you get the 6 essential basic tricks tricking starts to get much easier. Almost all tricks are essentially just variations of the following six basic moves: 540, 360 crescent, aerial, back flip, butterfly twist, and the double leg. This has an up side and a down side. The bad thing about this is that it could take you awhile to get good at tricking and if you don't have the dedication you could end up not getting very far. The good side is that once you learn these moves all you have to do is get good at these. After that learning the more difficult moves will be fun and no where near as challenging as learning the basics for the first time. All you're doing from here is adding spins, kicks, and merging moves or taking a new approach to the move. Even the hardest moves like the snapu-swipe is just the merging of a 540 variation (sideswipe) and a butterfly twist.
I would recommend reading through this page from trickstutorials.com:
http://www.trickstutorials.com/index.php?page=content/starttit will give you a very good idea of what to expect with your development and such.
