If you've listened to tape up to tape 4 a few times ... keep going, start tape 5 don't backtrack... once you've been through the tapes once you'll see the whole picture so to speak and it all starts falling into place. With the earlier tapes you don't really know if you're learning it or not and for most people it feels like not. The idea is to press on and then practice doing all the steps.
Good luck
Alex