check out the pipe ahead of time, know the over hang, it'll help you decipher the sort of pop you need. If its not as vertical, and slants more toward the deck, pop a lil to get the feel of it and adjust accordingly. If it's vertical, like 90 degrees, don't pop. You'll push off the wall too much. Finaally make sure ur carving into the wall properly. You want to travel down the pipe, but get some proper altitude by really carving up the wall as straight (prependicular as possible).
I wasn't sure how basic you needed. If you're smart and know that awesome if not, hope you learned something .