I had a poke around this week with Hugo on my computer, and managed to get a site set up with my data from this blog plus a nice theme. However, it's apparent to me now that I'd need to do a lot more reading plus some trial-and-error to get the site looking I would like it. And I'm not sure that it's going to be worth the extra effort.
To be honest, this site is running just fine on self-hosted WordPress, with a few plugins to take care of various things. While there are a few things I'd like to change, it would probably be easier (and perhaps more constructive) to do those by creating a customised theme and adding some PHP code where necessary.
I don't regret at least taking a look at Hugo, but it has brought home to me that going for a static site generator involves shifting a lot of work from the web hosting machine to your computer, including maintenance. WordPress isn't perfect, but it is good enough for my needs, and I'm no longer looking for a 'perfect' system.