I voted with my impatience and decided to go ahead and do the lens thing. Even if this turns out to have been a poor choice, at least this time I won't regret procrastinating it for another year when I had a chance to do it.
Yesterday wasn't too bad. I awoke with kind of mediocre vision, but good enough that I could be fairly functional for an hour or so before it really got to me, then switched into some glasses which we believe to be -2.0 diopters. I didn't do too much that involved reading, because I spent a fair amount of the day with pretty blurry vision, but I could mostly get by. It was actually less bad than I expected.
This morning marks day two. My eyes are now uneven, with (surprisingly) the right eye having significantly better vision than the left. I'm typing uncorrected right now, and I know that I'm primarily using my right eye for reading, which is kind of uncomfortable and probably going to lead to a lot of strain and headaches, especially since my vision is a bit blurry even in that eye. It also will make switching to low-power glasses awkward, because the ones I have at these powers are balanced between the eyes, and I probably need something in the -2 to -3 range in the left, and probably only about a -1 in the right right now.
Hopefully as things get worse they'll also even out, but today's likely to be a day for a lot of radio or mindless TV or such that don't really require a lot of looking at things, or something.