Once you do a few of these they are gravy.
However, one wrong move can make a good thing go south in a heartbeat. ACM has a nice fitting, long lasting evap for these but, you have to make a baffle for the l/h side of the case as the cap tubes are partially exposed to the airflow which makes the l/h side a touch warmer than the r/h. (About 5 degrees at high flow)
If the car has had a windsheild replacement done and the glass was allowed to slide down getting the wiper trans out is now damn near imposible without chipping the base of the glass. (which means it'll crack)