I did mine on my car (contour 99 V6) and it takes about 3 hours. You have to do it from underneath the car, don't even think doing it from top. And i did on a lift where i workso it's "easier".

Contour 99 MTX V6 fully loaded, stock with 110000km. Illuminated sunroof switch. About to do the mystique rear dome light conversion with eyeball dome light.