Basically, I planished with a body hammer and all-purpose dolly. Still a work in progress, being a little dimpled yet. I got a planishing bit to go into an air hammer and tried that on another panel, but it was way too hard to control it and the dolly. For $62, a HF planishing hammer might be worth looking into. Looks like the stand is another ~$25, which might be good unless you already have something you can bolt it on to to be able to control the fender while you're planishing.
Good luck with whatever you wind up doing.
