Once you've tackled the removable bits, like handles and armrests, the door panel itself needs to be separated from the door shell. Classic Ford door panel retainers are quite strong and can tear out of the door panel if you're not careful. Plus, the painted door shell is something you don't want to scratch either. Using a nylon door panel tool, such as the one shown, directly over each door panel clip is the best way to get the job done without damaging the door panel or the painted door surface. Set the door panel aside and remove the door's water shield (if it's still there).