We had a big hail storm a few years ago when I was on holiday in the mountains. I got some nasty dents.
You take a propane torch turn it to low setting, and go between 3 and 6'' from the metal, warm it up evenly! then take a cold wet cloth wipe it over the surface (starting at the begining of the panel as to cool a bit) do that a few times and the dent will eighter have disapeared or if you didnt do it right the first time in some lights it mite look like a dip.
if it looks like a dip then gently push it in again and try over.
^don't do the above unless you know you can do it! try with one in a door pannel (maybe someone has open there door into your car
if say you can burry a golf ball in your dent you mite have to drill a hole and pull it out (then refill the hole and primer/paint) or buy a cheap sucction cup thing...