Yep. Been there, done that. It's a big, finger cramping job but it can be done. I pulled mine off after it had been on about 2 1/2 years. Start at a corner and peel very slowly, pulling as close as possible to keep the loosening tab parallel to the surface. I found you lose less paint that way. I didn't have any luck with heat, but others have tried heat guns and hair driers with mixed success. You will leave some glue on the paint and I found lacquer thinner the best way to remove it. It doesn't dissolve with any solvent I tried, but lacquer thinner on clean rags works. If you have any stone hits on the Diamond Shield, the paint and/or clear coat may come off when you peel over that spot. We were able to repair a number of places where the clear coat came off, but when the underlying paint was damaged that section of the panel needed a repaint. Be particularly careful on areas with sharp a radius. We found some edge areas where the generator slide cover was were easier to pull the clear coat off. I think it was more a matter of poor paint adhesion rather than my fault, but I'm prejudiced. (LOL) Good luck with the job. I'm definitely glad I did it. I can fix paint chips, but the damage that occurred from stone hits under the Diamond Shield and the scratching that could not be polished out were beyond me.
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad