I agree with both of you. Even when you're changing your own, it is difficult to time things perfectly. I managed to get both of my cars changed over this weekend, but only after using both Friday and Saturday nights after getting home from social things with friends. It only takes about an hour per car, but of course this past weekend was the busiest I've had in ages.
It was just soooo warm last week. Couldn't bring myself to think about snow and ice.