Darkened panes at CIVIC

Hey, you guys! It’s gonna take me a while to get mine, but think about what else I can do with him to make him look even better. Has any of you experiences when it comes to darkening windows. I thought that if I darken the back panes and the rear, the car looks even better. What do you think (have ordered it in black). Unfortunately, I don’t have any experiences how to do that, what it costs and how expensive it is. not to do it yourself, but to have it done professionally. Anyone an idea???