Did bodywork with seals and trim installed. The seals set the doors and trunk lid at the correct gap. The trim lets you flush up without getting too close that you scratch paint when installing

I'm trying to understand and internalize this. I can see that this is really going the extra mile to achieve a higher result, but I can't figure out this one. Which is sad because I am getting close to primer and paint. So install the seals and all trim like I'm done and then align panels and doors, then remove trim and seals and paint?

Clearly this attention to detail is the difference between a 5k paint job and a 15k paint job, or a lot more.

Do they teach this technique at the average Community College Auto Body Course??? Know of a good book that goes over this??