65 Barracuda rear window tinting

The rear window tint on our 65 Barracuda is peeling and starting to look crappy. Previous owner did it with about 7 horizontal pieces.

For our needs we required heavy tint for rear window.

I've search for hours. I think I already know the answer - buy some sheets, watch some YouTube videos ...give it a whirl ... make sure I buy enough because it will take 7 tries .. lol

But ... aside from having "professional" installation done ... has anyone ever found rear window pre-cut kit? Anybody have any suggestions? Which brands? Best install videos or instructions?

Can it be done in one sheet? Looking at curves i would think at least 3. Dependent on size of sheets as well of course.

Thanks for help!