Originally Posted by Alfa38

I just changed plugs last weekend in our '11 Sport MT, while doing the valve adjustment, 99.5k miles. All the plugs were snug, no issues, and they were pretty clean and consistent in wear and soot. At 79k I don't think they would have needed to be changed, but of course it really depends on how the car was driven, what type of fuel was used, etc in your car. If it is idling and revving smooth, with good gas mileage, the only thing to be concerned with is whether the plugs are snug in place. It will take you about and hour or so to remove all the parts to check the plug torque and then reassemble.
You have to remove the intake, and it is best to remove the wipers and the cowl plastic (which is where the clips are that might break - I lost one and had one break) so that you have as much access as possible. There is a great thread with photos on a gearfixup by @07fit916 that shows the removal of these parts - follow that (up to the point of removing the valve cover, you don't need to do that of course) and you'll get to the ignition coils/spark plugs.