Finally got around to changing them this week at 103K miles. The spark plug tool mentioned worked great for all but two plugs. No way to get it to fit the two right near the brake booster. I had to put a spark plug socket in the hole, then attach a short extension, then a swivel adapter, and then the ratchet. I did those two and the back two on the drivers side first, and those 4 took about 2 hours and lots of cuts and scrapes. Called it a day after those 4. Did the other 12 today in about 2 hours. The other 4 on the drivers side were still a pain due to hoses, lines, and close wrapped wire bundles. All 8 on the passenger side were super easy in comparison.
Changed the PCV valve and cabin air filter today too. Glad this is finally done.