Just an afternote. With my mentioning Andreas' own playing as mediocre I didn't mean that this is making him a bad teacher. For a teacher it's more important what he knows about the subject than how well he can execute it himself. Otherwise someone like Andrew Roddick wouldn't have a coach.
Regarding your current piece of choice I must say that I'm not familiar with the Beatles at all. I know a few popular songs but never felt the need to further explore their repertoire.

Marcel