All done! Both ACs installed and working. I went slowly and carefully--paying attention to how everything was supposed to fit.
They look great, too--I remember the big, clunky room ACs I had years ago. These are smaller, quieter, more energy-efficient. They don't junk up the room (lol, well, any junkier than the rooms already were). They even have nifty little remote controls to adjust everything.
And I am still chipping away at uhf*cking my downstairs. It's coming along.