[DonC]

I think both of them are 8 mil so it's probably a push.
I had the 3M standard 8 mil installed on the car when I got it and it has held up extremely well. Particularly the spats on the front of the rear fenders. Had a mishap last Sep. and had to have the rear of the car repainted. When the spats were peeled off there were a couple of stone dings that got through the material but overall after 44K miles the protection it has provided for the paint is nothing short of amazing.
Since the original installation I've added strips to the top of the doors and under the snap posts for the soft top myself (the original installation was done by a vendor). Pretty easy to work with but make sure the prep is as good as you can get it first. It will make a big difference in the final look of the installation. Also be sure that the temp is at least 65 degrees, warmer if you can manage it. As I mentioned the material handles very poorly when it's cold.
Watch as many videos as you can find on the installation process for all of the different products that are out there. It's very likely you can pick up small pointers that will transfer over when you start your project.
Of course having the material installed by a pro is the easiest and will probably produce the best results. Those guys have usually been working with the material long enough to know how to handle any problem areas.
DonC