get it done professionally. and dont go darker than 20% if you want to see out of it at night at all. looks are all fine and good until you run into something.

shouldnt cost more than 200$

 

+1, there are many good stores on ebay that sell precut tint and offer customer support, you can mix/match tint and get the tools right from the seller, if it was me, id have a professional do it, around here there is a place that does any shade(s) on any car for 149.99 with a lifetime llumar warranty card, come spring, my accord will be tinted