We find a way to get behind the bumper dent, whether its from the tail light, or actually removing part of the bumper which we describe in another blog post where we repaired a honda odyssey.  

Next we add massive amounts of heat, then push the bumper from behind.  Yes you may be able to do some of this work, but pushing in the right spot and hyper cooling the dent to lock in the released pressure is key to holding the new shape. 

Often times there will still be crowns or smiles from the pressure, those too can be reduced by adding more heat, and then holding the crown down while super cooling the panel.  Finally we use the actual paintless dent repair method to do any finish work needed on the bumper cover.  This involves using our paintless tools to push from behind while maintaining the paint finish.