what is the fastest way to relpace rear plugs and cabin filter location

The cabin air filter is behind the glove box open the glove box drop it down and you can see a black plastic trim panel about 7 inches long an inch and a half high. Pinch the two clips at each end of the trim panel and the tray holding the cabin air filter is removed, The rear spark plugs are difficult to remove but are replaceable after removing the coils. You just need patience and 1/4 inch drive tools and some 3/8 drive extensions to get the coils and plugs out. I use an old spark plug wire to get the spark plug out of the spark plug well and start threading the new spark plug using the old spark plug wire with the new plug firmly mounted in it. Labor to replace the cabin air filter is 18 minutes labor to replace the plugs (all) is 1.2 hours.