Thanks for the replies everyone.
Like Gertrude the Wombat I am cr@p at learning from the books as well.
My instructor thinks that I am worrying unnecessarily and thinks I will have no problems. I am not that far in to it yet.
I guess I am doing my usual panic routine.
I have calmed a little bit now and taking the more methodical approach. I think the solution for me will be in the multi media CBT as opposed to the books.