Paul,
I started studying PM in the old Kepner-Tregoe methodology in 1994. I recently got PMP certified. Any PMP material will make your head spin
If it doesn't then it is not worth it's salt
Jokes aside, the PMBOK and PMP certification is sufficiently complex to help ground Project Managers and Project leaders in a standard. I also teach PMP processes to Business Analysts.
Check out the Lewis book at your local public library will give you a feel for whether it is the right book for you. It is well laid out.
Conrad