Ta-dah!
It’s done! What a pain in the ass that was. I screwed up the first time and had to delete everything and start over. Just to be on the safe side I even set up a new database. Anyway, the new blog is installed, in the main root like I wanted, with all the other files safe and sound in a folder. Go, me. Now all I have to do is install a bunch of themes and plugins and set up content…zzzzzzzzzzzzz….