If you're getting errors like "cannot load glx, you missed something in the install. Uninstall the drivers and reinstall them. Make sure they're loading in X by su'ing to root and running lsmod. You should see nvidia loaded as a module. You should've also installed all the Mesa packages for your distribution. If you'll state the distro, we might be able to be more effective in helping. Also, the XFree86 log file from /var/log would be a lot of help.
It never gets easier, you just go faster. - Greg Lemond