There was a guy that used to do body work that lived across from me. He had what looked like was a bent small screw driver with a T handle welded on it. He would just drill an 1/8" hole on the low spots and pull out the dent with this tool. Then he would mig weld the hole up and grind it off. Simple and fairly easy. He probably would have used a stud welder if he had one but this worked for him.

I have never done any body work or paint but I have been toying with the idea. Been thinking about going to the wrecking yard and picking up a couple of items to practice on.