Unless your door edges are really beat up, I think, take extra time to get the best looking taper (not going to be perfect). I'm spending countless hours filling and sanding to avoid any wavy action. The top of the door and bottom curvature is straight and I use as a reference....but still a big pain in the B.

54 Chevy 3100 Deluxe 3 speed on column. Keeping original as possible but changed to 12 volt system.
JB Weld..."I put that stuff on everything"