If you are talking about going forward twice, you have to do it where you go straight for the first input, and then down diagnol for the second; there is a thread on this...however, if you are trying to do a QAC from the first QAC in the same direction, that's a little different. I started off by practicing doing the QAC down diagnolly into the ground, and pressing down a to do the really fast dair shockwave...then started jumping instead of dair, and eventually you should be able to do QAC -> jump -> QAC -> jump, etc, and then once you get that, you can leave out the jump and just do QAC -> QAC, etc. sorry if that's confusing but I'm not really sure I understand your question