If you are looking to do some more advanced tricks, (i.e. barspins, suicides) try putting your seatpost a little higher so you can grab it with your knees, I see alot of riders who keep the seat really low, and that can be hard to grab the seat. Also, move the seat forward in the rails, this is equally important and helps a lot. It may feel funny to ride at first but it should help if your'e trying to get your riding to the next level.