Can’t I just fix this dent myself?   I think that is a reasonable question.  If you google “do it yourself dent removal”, you will find a lot of advice and ideas.  It has been pointed out to me that us paintless dent removal technicians make dent removal look easy.  This might convince people that they repair a dent the same way.
I have some advice on this. But one major warning.  If you are going to try to fix a dent yourself, don’t do it by pushing from behind the dent.  This almost always results in damage that can’t even be repaired by a professional afterward.   If you are going to try anything, I recommend buying a small suction cup and pulling on the dent.  This is honestly the only method that will create positive results for a non-professional.
I have seen a hail damaged vehicle that someone tried to repair with dry ice dent removal.  The metal around each dent felt as if it was tempered.  The metal was too hard to push the dent out.  (I believe that the dents did shrink though).  Also each dent had scratches all over it.  I suppose this was from rubbing dry ice on it!
I bought and tried an as-seen-on-TV dent puller.  I truly believe that this will only create an improvement on very minor, very light dents.  The kind of dents that don’t bother most people.  If your dent is strong enough to bother you, I bet it won’t repair with one of these.
I do believe that the hair dryer and upside-down duster dent removal method will work for a very few dents, but these are the same dents that will repair with the suction cup that I mentioned.
Most of the dents and dings that bother people enough to repair, cannot be repaired well by a novice.  I know this sounds like a self-serving opinion for a dent repair technician, but it is the truth.