[rotorwrench]

It will have to be metal worked to remove any sharp dents. I hammer & dolly them up a bit then use an OA torch to shrink the spots followed by more of the same to get it as straight as possible. Shallow stuff can be worked with a shrinking disk after a bit of hammer work brings the low spots back up.

A lot depends on the thickness of the metal when using paintless methods. Modern cars have thinner and sometimes harder metal than older cars. Most skin damage stretches the metal and depending on how much it is stretched will make the difference on how effective the paintless methods will be.