I am super paranoid about having work done on a new car by non-dealer mechanics, so I was curious about how invasive a procedure is to add an AC to a Honda Civic 2004. Do they have to take the guts of the car out to put it in, or it is an easy add on that a reasonably skilled mechanic can do it without screwing something else up in the process? And how much usually this procedure cost (if anyone out there has experience with it). Thanks a lot in advance. Ben