The first change (id:5:initdefault) is the only one to change. The other
defines what is different about runlevel 5.
There is a keystroke combination to exit X, or just reboot and the machine
will come up in command mode.
There can be a lot of problems in the nvidia installer but once it is going it
works great. I strongly suggest visiting the NVIDIA forum on Nvidia Linux
drivers and Fedora 2 Thread before trying anything.
http://www.nvnews.net/vbulletin/showthread.php?s=cda247219e46b3a0235c3eb8...
1&t=30399
If you have any questions, that is a good place for them.
-- Phil