Hey Chiphead, here's a couple vids from MY Friend Pete.
They cover everything you ask about, and come with my usual potty mouth warning.
Hinge Spring -
https://www.youtube.com/watch?v=hIWcDxOpmdA
Hinge Pin -
https://www.youtube.com/watch?v=5-2OhryITsQ
Edit: I suggest not removing the hinges if you don't need to.
I noticed the fender with the patch panel in your other thread will be lining up to that door, (same side) drivers side.
Assuming the door hasn't been removed or replaced, just replacing the pin should keep the door at the factory setting.
This would make much better assurance for proper and easier alignment.
Frank
__________________
Poncho Huggen, Gear Snatchen, Posi Piro.