I rear ended someone..my radiator was pushed back a few inches..can i fix it myself?

what shape is the core support in? is it tweaked real bad. hows the cross member - radiator support- you will need to pull that back out first, make some checks- measurements- then pull to adjust to as close to factory as possible. did the radiator hit the fan? if so replace the fan as well. your dad has enough knowledge to help with the job. if you need further instruction, go see a body shop, and flip them a ten for any advice they give that helps you out, kind of a courtesy thing.