Don't take this the wrong way, but its really not that big of a deal if its only .5 of a quart over. Some auto-x'ers overfill the oil to compensate for oil loss during aggressive driving.
The reason you are getting a low reading is cause you just turned your engine off. You need to give it time for all the oil to drain down into the oil pan. You will need to check the stick several times to get an accurate reading. Just relax and take your time checking your oil, its not a difficult procedure. Maybe you should do your own oil changes?