
You'd think I'd know better by now.
Thom and I (admittedly mostly Thom) toiled and strained and swore for several hours at this thing. Taking the old one out: piece of cake; putting the new one back in without a leak: not so much. After many scraped knuckles and enfuriated tempers, we gave it a rest for the night. I think the basic issue was the very tiny space in which we had to maneuver. I did go to HD last night to get a basin wrench but we couldn't even fit that in the tiny hole underneath the tiny sink.
After some rest, some church, and a good bagel, I gave it another whirl. It seems that laying on my back with my foot up in the air and my tongue out made the basin wrench finally fit in there. No leaks! Much improved! We'll put in a new toilet and tile floor perhaps after the New Year and then that bathroom will be more or less complete.
The plan is still to do the full bathroom upstairs during Thanksgiving week (although I am admittedly a little afraid to attempt to do this with our usual savior, Paul, being out of town that week). If nothing else, this little lesson has reminded me to assume the worst and plan for way more time than I generally think I'll need.