I used to do it with my buddies back in high school, with every car we could get our hands on. The biggest issues are cleanliness and patience. A steady hand with the exacto knife is necessary too. Like was said above, keeping out all the dust and dirt is a must as well as all of the bubbles.
Other than that it's not too bad, just look up some you-tube vids; i'm sure there are plenty out there.
One other thing is the material you use. I'm sure there are some threads around here on window tinting and the best tint to use. I had mine professionally done with 3M (50%), top quality... I expect it to last for life.
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