I'm looking to buy an airplane and many of the experimental I am looking at do not have transponders or ADS-B (unsurprising). I live in a Mode C veil, so a transponder (and, in a year ADS-B) will be required. I have an extensive electronics background, but I have not worked on airplanes.

As I evaluate airplanes, I would like to know what I need to do to install a Transponder in an experimental. I am not too worried about installing ABS-B on something with a transponder (because of the uAvionics Skybecon), but I cannot find information on installing a transponder from scratch. Does anyone know a link to instructions or an install video to install a transponder/encoder on a plane that has not had one before?