It's really not too difficult, if you follow NVIDIA's instructions. You seem to know what root is, so just "su -" and "cd /home/ button" or whatever your directory is. Then just follow the directions on the page you downloaded the driver from: http://www.nvidia.com/object/linux_d..._1.0-4496.html
If you run into problems, let someone here know. I'm sure you'll find someone who is helpful.