I think tinting is a bad idea. If you travel to different states, a problem may arise because there are different legal requirements for the level of darkening of windows in different places. It is better to use a car sunshade, which can be removed anytime. It is legal throughout the United States, and I believe the situation is similar in other countries. In addition, tinting can harm your glasses, so if you still decide to use tinting, by all means, find a good workshop.