Have a pro do it....
My . 02 is to have a full time window tinter do it for you. Pay them cash under the table and maybe offer an extra $20 bucks and most will put the "illegal" tint on for ya. They'll just tell ya that if you get it ticket for it, just don't tell them who installed it. I literally just did this last weekend. Believe me... . they'll do a better job, much faster than you could do unless you have experience with it. I'm not saying it's hard or anything, but it's one of those tasks that I find not worth the trouble of doing myself.