The hitch is the easy part. Usually the holes are already in the frame for mounting the hitch. It all depends on make and model of vehicle. The part that may take up the most time is the wiring. If you are lucky and have a vehicle that only needs the tail lights tapped into with adapters, it will go pretty quick. But, some harnesses need a 12v connection all the way up the battery in addition to the tailight adapters. While none of this is overly difficult, it can be time consuming depending on what you need to actually do.