As stated before, Phil's book is the best option for a DIY, the View Camera store has workshops on the system given by Fred. Unfortunatelly last year was the last time Phil conducted the workshop, he is getting up there in years and he has decided not to travel much anymore, but Fred Newman is very capable and very well versed in the system. I am sure his workshop would be worth while.
The BTZS has a web site...
You can visit and read some of the articles written by Phil. Presently there is a BTZS light, which mainly guides you through the testing and how to meter without as much in depth explanations as there are in the book. This was done by Phil at the urging of many of us who realize that it is an awesome system, but that many people are put off by all the dry technical explanations presented in the book. I gotta tell you, once you get the hang of it and realize how easy and powrful it is, you wont use anything else.
Good luck and keep in mind that there are many of us here who will be glad to help you through it if you decide to take a stab at it on your own.