OHWeb

I swear, sometimes the mere act of posting to a support forum causes me to figure out the solution to my own question. Here it is, for those of you who are similarly confused:

* Go to the directory on your new website where you installed wordpress (www.yourwebsite.com/wordpressinstalldirectory) – on Bluehost I think the default install directory is “/blog”
* There will be a link somewhere on that page that says “Log In”
* Click that link and log in to be taken to the ww.wp.xz.cn dashboard, which looks a lot like your old WordPress.com dashboard
* Go to Tools->Import->WordPress and continue the instructions for importing that I posted in my original question.