Mine goes something like:
Remove every last little light, data plate, mirror, window and anything else that I don't want destroyed.
Sandblast entire truck right down to bare metal.
Use kitty hair fiberglass body filler to fix the rust holes.
Sand that down.
Use lightweight body filler to fill in the tiny holes and sand paper scratches in the fiberglass body filler.
Sand that down.
Go over the entire truck with surface cleaner and a bunch of rags to remove any oils that might be on the surface.
Spray Gillespie black zinc phosphate primer from Rapco (used to use grey primer til I discovered it looks so much like clean freshly sandblasted metal that I could not tell where I had and had not sprayed primer, so now I use black with a much higher contrast)
Sand the primer smooth since it tends to go on kind of rough.
Then spray the green paint.
Then spray the flat black, and tan if I am going for three color.
Put windows, mirrors, lights and everything else back on, and then be afraid to drive the **** thing anywhere because I don't want to mess up my lovely paint job, and wish I had just left it just the way it was when I brought it home from the GL lot