I was attempting to follow the instructions here but one step requires using a command line tool that appears only to work on local WP installs not the WP install on my site.
- Backup your WP Database
- Enable SSL on Dreamhost
- Force SSL on WP Admin pages
- Replace old http links with https links (this is where CLI is used)
- Update .htaccess file with redirect
- Update site address in WordPress Settings???
I'm stuck on step 4 and have not attempted to update the site URL in step 6 (suggested in the comments).