With mixing, i practiced for a while but never really got the hang of beat matching. So i stuck with the same two records for hours untill i could mix them perfect. Just mixing them in and out, and youll notice to alter the speed different for the next time and the beats match for longer. I kept doing this untill i clicked on how to alter the pitch, slower or faster, when you hear the beats comming out of place.
Once you can line the beats up its just finding your own way of keeping them in, but you can get back to that if you need to later on.
Thats just beat matching, not sure if that helps at all. ;)