Okay, this is going to be really easy once you have the Elrepo repository. See my other post about installing third party repositories. Go ahead and get that setup then come back here for this:
yum install kmod-nvidia-304xx.x86_64 nvidia-x11-drv-304xx.x86_64 –enablerepo=elrepo
Hopefully it’ll modify your /etc/X11/xorg.conf file properly and then you can run nvidia-settings which should pop open a GUI for you that will help you setup even more.
It’s been a while since I set this up so let me know if I missed anything!