I have some elements to work on. This cutting and unravelling didn't quite work out as it was supposed to, but I muddled thru. I somehow made my opening a whole row too wide. Don't know quite how I did that, but I ended up with two cut pieces on either side instead of one.
It's done! It was scary going there toward the end. I dropped a lot of stitches trying to figure out the binding off (the book had an improvement that I couldn't grok so I skipped it). Then the same thing happened closing the heel. I simply couldn't figure out the 3 needle bind off and dropped a lot of stitches in the process, so I made something up and it seems to have worked.
On the bright side, I can now repair dropped stitches. ;-]
Now I'd better get to the second sock before I forget what I just did.