Another thing I've found is to only pull the clutch lever in, right as your going to put it in gear. If you pull it in ahead of time I believe the gear clusters stop rotating (they actually have a brake inside the trans to slow them). If they don't happen to stop with the dogs aligned, they land on top of each other. That second clunk you feel is when they finally align and engage. Once you get the hang of pulling in the clutch at the same time you press down the shifter you'll feel it clunk and know it's in fully in gear. I went through the same thing when I first got mine.