Liftdrag,
I'm still at it, I have started a couple of months ago and i'm planning to do the May exams for the first part.
There's a lot of work to do, But.........with your experience you might be way ahead of me!
On the other hand, there are so many purely theoretical things to learn that I can't imagine one uses this knowledge every day as a pilot (at least not in the exact way the book puts it).
So maybe the best way is to book for a DL course and se for you're self what you know and what you have to learn (again)
Succes!!!!
André