I finally cleaned the garage to make room for more boxes, and in so doing, took seven of the boxes of books to the used book store. After their sorting through them, they gave me an offer of $70... and I sent them on my way. Many of these were books I'd loved, though some were just so-so. But to see them all stacked up, being handled by others in this transaction was... sad ... but freeing. I was OK seeing them go. Maybe someone else can enjoy them now.
And my garage has space for more boxes to declutter the house.
I'm so excited. I have more boxes of books, as well as more books throughout the house to box up. But I've started the process, and I feel great about it.
