But, of course, it didn't work. (I say "of course" because I've had it with GoDaddy and their terrible support, support files, and things just not going as they say they will — installing this initially was hours of heartache, and only worked once I followed another user's directions, and not GoDaddy's).
The Home page comes up, but ALL subsequent pages result in a 404. I couldn't even log into my admin page at first, and had to use the full "/wp-admin/" URL to log in (and not simply "admin"). I tried the permalink solution (go to Permalinks, and click Save), but that didn't do anything.
There is no htaccess file in my WP root folder, so I added the standard one. Didn't work. I removed it again. No change.
Edit: I just went through the database and replaced all the old URLs with the new URLs. This did NOT work either. (Example: dev.url.com to www.url.com