Did you read any of Claire Davies' books? She's the one that first developed the concept and that is a good place to start. I read The Frozen Shoulder Workbook a few years ago so my memory is foggy but it does have a lot of diagrams.
There are a whole lot of books that build off of her work.http://www.amazon.com/These-Bestselling ... _2_rsrsrs0
I know I'm being pedantic (but not picayune, for goodness' sake), but Clair Davies is a man, and was not by any means the one to develop the concepts of myofascial pain or trigger point therapy. He did develop techniques for self-treatment of trigger points. The concepts were developed by Dr. Janet Travell, President Kennedy's personal physician, as well as others. Travell's theories and clinical practices were researched and systematized by Dr. David Simmons. They coauthored the first comprehensive textbook on the subject. I bought a copy in the 80's, and it has been quite influential in my practice. Davies, I just noticed when I googled him, was a piano technician for a respectable career, but went back to school at the age of 60 to become a massage therapist. While I feel a certain affinity with him, I want to point out that I have made no major career changes since the age of 50.