I had @manton completely clear my blog, and re-imported all 592 posts. They are in broken HTML (no fault to MB’s importer; it’s broken on the WP blog) and some of the images haven’t transferred.
So I need to go through every post in reverse chronological order, as some the posts link to earlier posts on my blog (on the old site). I haven’t registered a domain yet, so all my internal links have to be relative (without domain name, you know
https:// etc.), must also be done by hand, alas.
Needless to say, this process-by-hand is error-prone, unless you’re slow and methodical. I guess a few posts per day is what my aged brain can successfully process.
So yeah, it’s a lot of work, but it can be done.
P.S. Did I tell you I don’t have a desktop computer, only an iPad? Luckily, there’s the free version of Drafts and their excellent HTML > MarkDown script you can install afterwards from their website.