Good luck.Just finished prepping the surfaces yesterday. I might start with something easier like the gas cap or top of the rear spoiler which are flat - hopefully I don't screw that up! - then get more complex from there. Here goes some baby-stepping . . .
Gas cap would be a great piece to start. What panels did you end up deciding to cover with the film? Top of the rear spoiler is a bit unusual; I don't expect that area to benefit that much from clear film coverage. Are you planning to cover the entire roof panel as well?