Just to make sure I understand...
(1) I can import the data from my original site and mess around with it.
(2) Then I can create my style, practice with add-ons, etc until the site is just the way I want it.
(3) I then export out the style, and make sure I notate all the add-ons that I have on the site.
(4) When I am 100% ready, I turn off my old site.
(5) Then I do what with xenForo to prepare for the final "install"? Do I delete the testing xenForo database? Do I have to do a complete reinstall of the xenForo forum software? What do I need to do to start with a "blank slate"?
(6) Then I import the final copy of the database from my old site.
(7) I import the saved style, and reinstall the add-ons.
(6) I turn on the new site.