Blah blah, just trying to get the old site migrated to the new spot, not as easy as I had hoped. Showing some (old) content again, but some pages load as they should (or at least: as they did before); others seem to miss some css and get a 500 internal server error in the process of retrieving them. Well, it’s an improvement over not having the site up at all, so… going to call it a day and I’ll get back to this later.
Edit: after I found the “show PHP error log” button on the new hosting site, I was able to fix above. There still might be other stuff not working, though, but I’m happy I managed to get to this point after an evening of much troubleshooting.