Hi,
1. Download a LiveCD Fedora.iso (it takes less time than download the
DVD
iso file)
2. Launch fedup --iso Fedora-LiveCD.iso, that make the job of adjusting
GRUB2 i.a.
3. Reboot the system
3. Choose LiveCD entry from GRUB2) Perform the installation as you wish
Unfortunately, the way the livecd's currently work, they can't be used
to do upgrades. They merely copy the live installation byte for byte
to the selected hardisk volumes, blowing away anything that's already
there.
--Ray