I did mines a few weeks ago at 91K bought the truck at 84K. I drove from NY to FL and decided to change the spark plugs when I got there. Bad idea. I broke the boot in one of the coils, plus I didn't have a swivel extension. So I decided to just put everything back and drove back to NY a few days later with a little misfire. Once I got to NY, I started to change them. Took me about 4 hours just to get to the last 4 on the each side was a pain. But god knows when the previous owner changed them. They were pretty worn out. As long as your mechanically inclined, and have tools and take your time. You will be fine. I removed the air box and resonator and battery to have room. Saved myself a couple of hundred bucks but have the scars that makes memories last. haha