Mark at Foothill Paint & Fabrication just dropped this video - really nice visual illustration of what all needs to happen and essentially follows the Tech Guide, align hood then get the fender aligned to hood.
Also echos Carl's precursor that if Cab isn't right to begin with, being square to the frame, you're going to have problems.
Interestingly, he acknowledges he had about 10 hrs of tweaking on this to get to where he felt it needed to be!
And I'll see how it goes in my case, but I'm pretty sure going to need those shims in the same place on my truck.
www.youtube.com/watch?v=oD2MPN_-px0