quarter panel dent

i got into a car accident and i got hit on the driver side quarter panel just there the fender meets the tire. The tire now rubs and i was trying to get some tips on how to pull the dent out without messing it up more. Any ideas?

i was reading about a technique with a hair dryer and compressed air, and also another technique with dry ice. Has anyone tried these before? if so, how well does it work on a quarter panel?

thanks