New to body work and paint

[lewisaric]

I am about to start my frame off restoration on my 68 short step. I`m new to the whole paint and body world, but I think with a litle guidance I can have a great outcome. The only major sheetmetal work I will be doing will be removing my drip rails, replacing rockers and replacing front and rear bumpers with roll pans. There is very little rust in the truck. Only in the doors(none to the cab itself). I know that I don`t need to cut the old rockers out before I get the new ones to make sure I don`t cut too much. How would I go about shaving my drip rails(other than start hacking it up). I want to do everything right, and not cut corners. Thanks