I thought your name was familiar looking. You haven't used the PWMS before?
Anyways, there are lots of people around who had learned using only the book. Not me. The forum person that comes to mind first is "youngprer". He has loads of posts. You can even do a search on your topic. Book only learners have had a thread of two in the past.
Therefore the answer is you most definitely can do it with only the book. However, you have this forum which is a great addition to the book.
I would say to your to stop trying to guess how the system works. All you need to know is that it is a how to book. You other-than-conscious mind (some say sub-conscious, Paul doesn't seem to like it, I like inner-mind or inner-self) has tremendous ability. The PWMS is just a method to get around the limited conscious mind for the PR step, and then pass the information to the conscious mind during the activation step. There is a lot more detail, but those are the big ideas.
I'd say start reading and have fun. Really don't under estimate think like smiling and having fun when learning.
Sending love,
Iam2 
