I did lead for the first time on my Olds. Way easier than plastic filler in my opinion. Sanding Bondo is right up there with finishing drywall in my book. Next time I will go with the leadless soldier, so I don't have to worry about health hazards and I can comfortably finish sand it. No 'beat the clock' or 'unhardened' nightmares either, just keep working it until you get it where you want.
Bought a kit from Eastman's and used a propane torch. There was a DVD of tutorials and tips, and I also found some info on the net. I thought it was easy to pick up. Definitely give it a try!