There are plenty of car repairs you can do yourself. For example, over at Imgur, user sxpnthr uploaded a guide on how he fixed a car dent with boiling water.
All you need is a teapot of boiling water, rubber gloves so you don't burn yourself and another pot of cold water. Pour the hot water on the dent, and while it's warm, reach from the inside and pop it out. Then, while it's in the original shape, pour cold water so it quickly cools down. Check out the full gallery below for step-by-step instructions with pictures.
Just fixed a dent in my bumper [Imgur]