Well, the upgrade is running. The basic upgrade to a functional 1.0.1 (from 0.72) was easy. The killer was that they decided to change names of a bunch of files and functions, from b2* to wp*. This, of course, broke the customizations I had done. Even the style sheets I had made broke, though they shouldn’t have.
I know they wanted to get rid of all the b2 file names, but… I would have preferred not to have to spend the evening redoing my CSS and the HTML of the index page.
At least the files are all wp now, so with luck I won’t have to do this again.
Incidentally, there is a WordPress Documentation Wiki, which I had not seen before. Seems useful.