I'm converted !
Well, SU's free shipping got my kit here in 2 days (weird, tho- they just threw the pieces into the box with heavy paper baffling. I'm glad the gasket didn't get caught on anything).
A bit of an adventure: each of the 10 mm adapter bolts took a different combination of ratchet drive/extension/socket, the 15mm bolt on top of the oil cooler was frozen, and I cut the s*** outta my thumb when I slipped off the stubby ratcheting box.
Still, the noob triumphed with the help of you forum friends. I dug out an old crappy 15mm that happened to be shorter than a standard combo wrench- it gave me just enough torque (with some WD40) to unfreeze the 15 mm, and the stubby did the rest of that bolt. The upper-two adapter bolts seemed easier to deal with using a 1/4-inch ratchet drive with its skinny extension piece that allowed the head of the ratchet to clear the oil cooler.
I was a little nervous about re-using the gaskets at the bottom of the oil cooler, but no one mentioned installing new ones, and the oil cooler had a system of two gaskets: one round, complicated o-ring type and, outside of that, a flat rubber one like you get on most oil filters.
It all looks bone-dry after a quick drive around town. Anyone have leaks appear later, like after a hard highway trip?
It took me almost 4 hours to complete, but I spent 1 hour f-ing around with the 15mm bolt and determining that my new qwik-drain plug came frozen shut, inoperable. Still, it was worth it: this was my first self-change of oil on this car, and whoever designed the cartidge filter system needs more therapy. (Sorry, I know some people love 'em, but oil comes out at so many points in the process that it's hard for me to believe the environment is any better-off with cartridge systems. Their filters themselves surely carry less oil into the landfill, but the six shop towels you need to clean-up carry it in anyway. I'm sure you spill less after a few changes). I don't know why the places that accept used oil don't also accept the used filters- wouldn't that be the better way to go?
Anyway, thanks to everyone for your help. I would not have attempted this w/o it.