When I first recieved my ASUS UEFI motherboard, I made many mistakes, including the trashing of a 1.5TB HD which I thought could be used with a rack mount like I did with my previous MBR installations. While it didn't take long to understand how UEFI worked, it did take a while to get comfortable using it.
Think of UEFI as a replacement for Grub. In dual boot situations, you choose your OS from UEFI and it points to a bootloader in /boot/efi. That in turn points to another bootloader, in Linux case, Grub, which you use to start the OS you've chosen. Fedora has been trying to put Grub into /boot/efi, but, their experiments still only work with their distro.
When installing in UEFI, you must be able to boot the installation cd or usb stick in UEFI mode. You also have to use the common /boot/efi partition, this is where the UEFI bootloader is installed. Once those 2 requirements are met, it's just a regular install.
I have 4 distros at present on my UEFI machine. Debian, Fedora, openSUSE and siduction. All have their own separate grubs, so, no problems trying to maintain a single grub for all installs. In fact, I've turned off the os-prober in each of their grubs, because trying to boot one distro from another distros grub in UEFI, is an experiment in terror. Once resulting in the corruption of my NVRAM (the place where UEFI firmware stores info on the motherboard).
I first learned about UEFI from Rod Smith, who is active on the fedora forums, and is also the author of gdisk, link here:
http://www.rodsbooks.com/efi-bootloaders/ (Which is more technical than easy reading)
I also use Rod's rEFInd as a UEFI rescue disk:
http://www.rodsbooks.com/refind/Then there's the Arch wiki which has a lot of good info:
https://wiki.archlinux.org/index.php/Unified_Extensible_Firmware_InterfaceOr the recently written blog by AdamW of Red Hat fame:
https://www.happyassassin.net/2014/01/25/uefi-boot-how-does-that-actually-work-then/ (Easier to read)
Then there's the original Tanguy Ortolo post that devil posted when I first started inquiring about UEFI:
http://tanguy.ortolo.eu/blog/article51/debian-efi (It's a bit dated, but, easy to understand, and, the comments to the post are also helpful).
After you become a little more familiar with UEFI, I'd say try the siduction install again, but, using the instructions I posted. I'm really happy finally having siduction as the main distro on my newest machine.
BTW - The author of the siduction installer, hama, actually helped the most, by putting the EFI options into the installer. I used the siduction wiki and his improved installer to make the how-to.
