It all depends on the size of your ding ...... if the ding is same size as a quarter or smaller you could get the ding out yourself....... first you would need to get some dry ice not a lot, maybe a size of a golf ball..... ... to prep the area make sure the ding area is exposed to sun light for at least 30min...so the sheet metal will warm up, then take the dry ice (make sure you are wearing a very thick industrial gloves, otherwise it will be painful later on) and start to rub the ding area with the dry ice, depending on the ding it should pop out due to the contraction of the molecules in the sheet metal..... hope this helps