2\" putty knife & a small hand held propane torch.
heat the area in front of, but not directly on, the putty knife. dont heat it up too much or it turns to goo. use the putty knife to follow the trail of the previously heated area.
this is the method i used on the pans and fenders on my 56. it took a little practice to dial in the proper technique, but it ended up working fairly well.
also, watch the amount of heat or the paint on the other side of the fender will bubble.
good luck mike.