Under the best of conditions this kind of repair is difficult.
Take a look on the INSIDE of the car and see if the dent is visible and accessible. If so, you can use a hydraulic jack and push it back into place. If there is enough room you may even use a large hammer to drive it back out.
If you can't get to it on the inside, you may be able to weld a piece of metal on the outside and use either a puller or slide hammer on it. When in place remove the piece of metal and refinish the area. I suggest you fix the brakes before you test drive. HA!
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If you need a shoulder to cry on, pull off to the side of the road.
Death is the number 1 killer in the world.