It's quite a lot of work. The easy part is using a rubber mallet and banging the basic shape of the dent. Dont go too far and risk stressing the metal as the metal is pretty thin, and old.
From there, have fun with the body filler. Sand. Body filler. Sand. Sand some more. See a sort of nice shape, no? Sand. Sand some more....and so on and so on.
It's not rocket science, just takes a lot of patience and sandpaper. One trick is too not over add too much hardener with your putty. You want to be able to work it for a little bit to get your shape.
And of course, I'll do the dents for you for $100. I live in Michigan and need all the side work I can get my hands on.