I got the gearwrench socket/extension, and discovered that the magnet was too close to the open end. It wouldn't quite engage the hex on the spark plugs.
Cue large vise, and a bolt to push the magnet a little deeper... Worked great after that.
I also needed to make a debris scraper from a chunk of 3/4 copper pipe, with a tooth cut in one end. Fleet usage saw lots of silicone grease, and the broken chunks of plastic from the coil's harness in the bottom of the hole. Scraper broke the plastic up, and let me vacuum most of it up the pipe. The rest got stuck to the scraper by the excessive silicone grease.
Plugs were a bit of a bear in some cases, but came out fine.