worth a day trip to SA. i used to take it to guy and the whole thing took maybe 2 minutes.
I would drive in the garage bay, roll down window, he would start scrapping the sticker off, then apply new sticker, ask for money (14 and change), i would reverse out, and on my way.
Most of the shops on the west side of the city have this same process. You will know your in the rt area once you notice a car repair place every other building.