[Users] Upgrading to Fedora 18

I have installed Ovirt 3.1 on a Fedora 17 server, and would like to upgrade to Fedora 18... The documentation I have found on the mailing list is unclear on how to do this. Does anyone have any pointers on how this can be done.. as well as upgrading to Ovirt 3.2 after we've upgraded to Fedora 18 Thanks In advance