All the lessons are broken into segments, so learn 1 or 2 segments before moving on to the next.
This is how I learn them, lets say theres 8 video/tab segments to a lesson, I start by learning the first 2 segments, playing them over and over again until they are firmly in my head without having to look at the tab, then I move onto segments 3 & 4, but each time I practice, I play segments 1 & 2 in front of it, then moving onto 5 & 6 playing 1,2,3 & 4 in front of them, this builds up the whole piece and generally by the end I`m really only concentrating on the last 2 segments as I`ve probably played the first 6 a million times already
Once its memorized (the piece, not the tab) I concentrate on the timing and cleaning up the more difficult parts, and hey presto the whole thing is put together