Something odd has happened, and my hand independence just clicked into place. It’s far from wonderful, and I’m still buzzing like a moth lamp, but something clicked someplace nevertheless. I’m going to see if I can’t work on some more carols, and on the more involved version of “Vaga Luna” that I had originally arranged.
Update: I think a big part of it was that one hand had been reversed. It felt like someone had swapped around half of my body — what are the high notes doing on THAT finger?!