I basically looked at it as the lessons are what I should practice until I felt I could move on.   

If I found myself getting too frustrated with a particular chord or lesson then I moved on and came back to it later.  Anders also gives the impression that you should just always have fun with it and not have a rigid practice regime, just work on what areas you feel you personally need and experiment with what you have learned already and have fun!

I found some lessons were tougher than others and took longer to understand, the two finger power chords for instance took me weeks before I could move them up and down the fret board, so I just kept coming back to the lesson, focused on it for 5 minutes a day for several weeks while I carried on learning other lessons and it just clicked one day. 


Good luck :)