For me, if a lession is basically informational, I'll digest it and move on to the next one. If there is something to actually do -- and they are pretty clear on that -- I'll practice that one lesson until I feel I'm able to do what's asked pretty well before moving on. If I'm fumbling all over the place on a lesson, I'll stick with that until I can do it right before movig on. That has really helped. I have trouble with playing with music for some reason -- it always throws me off -- so I have to work on those lessons over and over.