Cy Creamer

ITS THE REAR QUARTER PANEL. haha I have a large dent in the rear quarter panel at about 3oclock when looking at the rear driver side wheel that goes all the way to the trunk with the antenna facing turned outward. Can I hammer it out it myself or should I just buy a new rear part to install? if so how do I hammer it out from the inside? It's too deep to use any type of suction cup repair. I'm assuming it isn't as easy as just taking my nail hammer and just swinging away. haha