Go to your local Menards and pick up a couple of 50 lb bags of black magnum for 5 bucks each and go at it. The sheet metal you may want to have stripped by a professional to reduce the possibility of warping or strip the panels using a DA or chemical strippers.
I have done my own sandblasting on the frames and also the inside and underside of my last two broncos I restored. I also can have the heavy metal type items shot blasted at where I work. I want the car media blasted to avoid wrecking anything, plus I am really sick of blasting bodies as it is a very messy and lousy job to do at home with a shop air compressor.