The first song of the first set is the easiest for this. There are no spikes and the crossfades are spaced pretty far apart so they are easy to anticipate.
I find that I have a hard time with the crossfades since it's hard to tell where the middle of the slider is. I've noticed that you barely have to move it away from L/R for the game to register "middle" though. So don't worry about trying to find the true middle of the slider, just bump it enough so that the game moves the track. That way you won't move it too far and have it flip to the other side, wrecking your streak. I think I'll eventually get the muscle memory down to do it properly, but in the short term this seems to work pretty well.