I did a pair of Fusions a bit ago. Simple detectives cars, not much to them. Overall, it wasn't too bad and the only thing that really stands out is that you will have to drop the front fascia to access the headlights. In fact, you would need to drop the front fascia just to simply change a headlight bulb...it is not possible to do it otherwise due to the limited space, headlamp design, and the pact that the bulbs are completely contained in the light housing. All wiring is internal to the housing and there are sealed rubber covers on the access hole. Hard to explain, but a blown headlight bulb is not an operator level fix in this car.
Actually, I think install shops could start chasing this market...advertise in local papers that you change out headlight bulbs. Price it cheaper than the dealerships and I think it would be successful.