+1 on Clark's and Arnworks sites.
Porsche Manuals Here:
Documents - Porsche 951 - texasblake.com-
for further detail and things not covered elsewhere.
Ask too if anyone here or on Rennlist is near you and might stop by to give advice as a second pair of eyes and ears when assessing a problem or even to coach you through something a bit challenging as you do it for the first time. Or maybe they are doing something you might be able to watch or help with and learn so you know when you turn around to work on yours. I do this to my brother a fair amount.