Getting the emissions tested is a fairly painless ordeal the last few years in Tucson, Arizona. We dive up wait for a few cars ahead of us and then pay a few dollars. Not too long after that you are on your way having been tested for another year
Once I get my notice in the mail, I watch the testing station each time I drive past it. As soon as I see a short line I pull over and get the test out of the way
First you pay the fee of $12.50 or something then you pull ahead to the testing bay
Your drive wheels (for my truck, the rear wheels) go into the rollers and a plug is connected under the dash on newer vehicles. A few moments later you are on your way
That is all there is to emissions testing in Tucson, AZ. This year it took me about 10 minutes including the wait in line to get tested.