I have a massive dent in the rear quarter panel of my 2 door yukon. It has creases and extends from the window down into the fender. I've done a bit of research and got some ballpark estimates on the repair and I would like to DIY it. So... My main question is, can I hammer this out from inside the back of my truck if I remove the plastic or is there too much stuff to go through? What is the cheapest way to take this dent out myself? I'd really prefer to not drill holes, that's why I want to know if I can get at it from the inside.