I will bet you will be damn good at it after one panel.
I have found that every material is different. Some, the more heat the better, others that heat only allows the plastic to pull off the glue leaving the glue on the panel which is a MUTHA to clean up.
One thing that has worked wonders for me is to stretch the material longer as I pull up and off. I have had wonderful experience with this method.
I do know one thing, you had better have a Time and materials estimate on this one. Giving a fixed priced could bite you BIG time. This could be a HUGE job making stripping the paint and repainting look good about half way into one.