I actually did the sandblasting, cutting and welding myself, but my car was not too far gone. It still was bad enough to get me creative with hammer and metal, but not unworthy of fixing. I had the same rust on the roofline, just sandblasted it, metal prep, primer, and glass to fill the little divits. Not the best fix, but hey, I'm nineteen and on a rather limited budjet. On the other hand, I did'nt do a complete resto on the body, so there will likely be some more junk to take care of with the frame, etc. down the road, hopefully not too soon. Whatever you do, don't use the flexible metal "fender fixers" and bondo. You may see a year of looking ok with that. all or nothing. Cut it out, buy or make a patch, and weld it in, completely sealed, then you are safe to smoothe with fill without moisture problems from behind making the hole bigger. This is the sort of thing that can't be rushed, but with a book and a ton of patience, anyone can do it (eccept if your car is not straight looking, then it becomes an art) Anyways, gotta go, talk to ya later man!
Dylan