Paintless dent removal

I've been told- as long as it's not creased, it's a candidate.

I've also heard can't be creased or paint cracked.

I'd like to try it on my Renegade's door dins but there are 2 small ones right where there's no place to get behind them, at the extreme rear edge of the drivers door, over where the skin wraps around the shell.
You can still get them out on an edge sometimes if you use a glue puller and even a person with no talent stands a good chance of at least making them look better.