I second Steve's thoughts on this. If its a one time deal send it out. Talk it over with a few guys that are into hot rods or classic cars to see where they suggest having it done. You want someone that is used to doing sheetmetal items otherwise you may have warping problems. If you plan on restoring more things get a pressure tank blaster, a good fresh air helmet, a BIG air compressor and be prepared for a messy, messy clean up area. I blast all of my frames, cabs, boxes and fenders down in my sand pit ( no clean up it just goes back to where it came from
) , using a 185 cfm Ingersol Rand screw type compressor with air dryer ( wind right now and can safely blast a flat door panel or hood from 3 feet away with out warpage- just keep the nozzle moving) ,with a 3M fresh air helmet. I have used black beauty blasting sand and silica sand. Main thing is SAFETY, you don't want to breathe ANY of this stuff in. Most blasters around here charge by the hour. And the hour rate varies, just remember cheaper is not always better.