Well, the vertical blinds are installed. Mark did most of the preliminary stuff last night, measuring, installing brackets and screws, and I-know-not-what else. Tonight, he took the old horizontal mini-blinds down, and then I helped put the new ones up. Snapping the main piece onto the brackets was a two-person job, as it's as wide as both of our front windows combined. Then I handed Mark the vertical slats, and he attached them one by one.
The blinds passed the Captain Test not long afterward. Captain sat on the kitty window perch and stuck his head through the blinds to look outside. All was well. Stanley hasn't tried this yet, but I'm sure he will. Just give him time :o).