Alan,
why dont you do the sides that are not in direct sunlight first (panel by panel), which would be the driver side on those pics,then swich the car round so its facing the other way from the garage and do the sides that are now in the shade panel by panel, passengerside. Thats how i do it. One side of your car will always be in the shade.
I always wash, ploish and wax my car panel by panel. Makes it easier.