probably doesn't matter under most conditions. It's pretty common for mountain bikers to run front and rear tires in opposite directions in search of max performance, but I've never been able to feel a difference. You're certainly not going to fly off the road and crash because of it.
on the other hand, since you know they're wrong and you admit you're lame at changing them, wouldn't this be a good time to get some practice by turning them around? Removing and replacing tires is such a basic part of cycling that there's just no reason not to be good at it.