Tint your own windows?

Should I try to tint my own windows or let a shop do it. Id rather do it myself if I could. From what Iv seen all you have to do is get some tint, spray the windows down with a real soapy water mix and place the tint on the windows. then cut off the access and squeege out the water/soap mix. I know it makes it easier to do the front and back windows outside of the car to cut them and get the shape then install it on the inside. Got any ideas?

I think Im leaning more toward going to a shop and have it done. Luckily in TX the only tint law's are for the driver/passenger doors and the front windshield. You can go as dark as you want on the rest.
GaPonyfar- The people that are doing tint jobs at the shop had to start somewhere. I wrote what I knew about it to see what other steps there are. I dont know how the hell anyone can judge if a person has the ability to do something or not by what they post.
"It is not the critic who counts: not the man who points out how the strong man stumbles or where the doer of deeds could have done better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood, who strives valiantly, who errs and comes up short again and again, because there is no effort without error or shortcoming, but who knows the great enthusiasms, the great devotions, who spends himself for a worthy cause; who, at the best, knows, in the end, the triumph of high achievement, and who, at the worst, if he fails, at least he fails while daring greatly, so that his place shall never be with those cold and timid souls who knew neither victory nor defeat." T. Roosevelt