I have done a few small sections on my Cobra. And I have had pros do my other cars. Technique is everything .. if you can do window film, you have the basic idea. But the Cobra is very voluptuous, as you know, there are compound curves on compound curves, and this stuff doesn't like to lie on curves. The Cobra film kits deal with this by having many pieces ...
Here's a tip .. pay Gary the extra $300 .. you'll be pleased, not pissed that you paid $550 for something that looks like crap. Of course if you're out of town .. buy the kit and take it to an installer
Sam