Thanks Wornoutoldman, while Eidnoc raised the open questioned and then vanished, you got to the meat and potatoes of the subject. It's funny that you mention that book as I bought it a few years ago and read it. It has some great old pictures of old cars and old metal.
After reading the book I figured out it was something that you just couldn't read about and go do. Some of the theories of looking at a dent and how it started and where it finished and backing our of the process I really didn't get. But then I haven't had the time to get an old fender or piece of sheet metal and practice but the book is a fantastic window into an old school art and one day I'm going to work on it.
To look at the "pick" and cross bar dent repair system is an interesting idea too. I have one of those maddening little dents in my show car where a 4X4 just happened to fall and the corner caught the corner of the car just right to leave a dent. This is the kind of dent that someone with a light touch of a pick could massage it right on out. But thanks for that information too.
On Youtube I will have to go over there and spend some time.
But what I have see of that are the special lights and the reflections and the straight edges. Again this is something that you really need to practice to get it right....................
Thanks again for taking your time to share some valuable information..............
Lisa