Having pegs helps a lot. If not even for the sake of balance, it gives you a target to focus on to get the right initial positioning. From there it's cake.
I disagree...some douche at my local waxed up the tops of the boxes so he could powerslide them, and I ate shit a few times sliding out on smiths. I don't think you need wax on anything except rough concrete honestly. I've never needed it.