Even if it's not about a repair, but a cosmetic fix-up like a tint job; you'll still want to be crystal clear about what a windscreen requires in terms of quality service, and how to find the best company to work with as well. The first feature to look for, obviously, is that the company can work on modern cars and their special windscreens. This might sound a bit redundant as you'd expect that every company on the market for windscreen services is like that, but the truth is a bit different. If your car's windscreen is a modern variant that features some strange, complex type of technology, you may find that not so many companies out there are willing to work on it.
Once you've found an appropriate company to do the job for you, you should also prepare your car accordingly. There are usually various things that you could do to make the vehicle more suitable for a windscreen repair or tinting job, and the company you've chosen to work with should be able to tell you all about that. Just listen to their advice and prepare the car accordingly, and make sure you let them know if there are any specific details about this car that they should know about before they get started (e.g. if you're using custom-made windscreens).
If you're tinting your windscreens, another thing to keep in mind is to obey your local laws and regulations. Most places have some limits to the amount of tint you can apply to your car's windscreens, and this varies from one jurisdiction to another. So before you get started, make sure you familiarize yourself with your local laws and the restrictions they place on you. The windscreen tinting company you've chosen should be able to help you out on that if you're feeling lost, as after all, they should be the ones that are most familiar with those regulations.
Don't be in a rush! You should set aside some time for your window tinting job and contact the company to get it done once you feel your schedule has cleared up a bit. You shouldn't rush them to complete the job faster, because that might compromise the quality of the final product a bit. And with window tinting, something that's more or less permanent, you really don't want to mess up the job. Once it's done, you can enjoy your new tinted windows for a long, long time!