I would never consider doing something like this as a DIY, the results would be the difference between COOL and CRAP, as GS stated. Prices vary, and you don't list your location in your profile so no one can help you with local pricing, but go for a non-metallic and you'll probably be looking in the $200-$350 range.
For more detailed assistance as to who might be recommended in your area, I suggest updating your profile and/or posting a question in your Regional Forum.
Click on my name for pics of my silver with 35%... Tint is a "MUST-DO" for any color IMHO
Best of luck!
