Anyway, once it was unclogged, there was still the task of getting the router back up and running. We'd taken it out of the mix to simplify things while diagnosing the problem, and earlier in the process I'd reset as one of my early attempts, so a lot of settings had to be looked up and entered. There was also the part where you have to turn things on in a particular order to make it all work right. That was another hour or so. Bozhe moi.
It's all working now, though, and, as a gift with purchase, I now have a (longer than expected) list of all the wireless access points in my neighborhood.