Vehicle window tinting is not the same basket as store front window tint. If you're new to tinting - don't think that you can just jump into it and start whipping out car tints. It's a much more complicated process. For one - you have to remove interior door panels to access the
windows properly. This gets easier with every car that you do, but each car has it's little quirks about getting the panels off. The right tools are suggested to properly remove the panels so you have the investment in the automotive tools to do that. Then start thinking about the rear
windows. Think about the amount of working room - the amount of room you have to do the work in. It's a very tight space and a very awkward angle most time to do these back
windows. Then after you have thought about all that - start practicing your technique on flat
windows - like store fronts and such - so that you can master the ability to lay it down flat and get all of the application fluid out and leave no bubbles. It's not like vinyl where you can just pop the air bubble and squeege the air out. That little hole is gonna let light in and on a tint it's gonna show up.
I'm not saying don't do it yourself - I'm saying THINK LONG AND HARD about it before you do it yourself. I have thought about it. And I would just as soon leave it up to those who do it currently.