Installing NVIDIA geforce 9 driver using the installer I got from their website

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http://askubuntu.com – In my ubuntu 12.10 it didn't detect my graphic card. When I check the graphics in system settings>details it says none I've downloaded my driver installer from the NVIDIA website, make it executable, then it ran but it say I doesn't install on a X server.. I read in a blog that I have to download drivers via the software center called jockey. After the installation I couldn't find my driver in the list..plus the problem it mentioned if I messed up then it will mess up my boot. Can't I just use the file I got from nvidia to install it? Speaking of which is it necessary here since I don't pla (HowTos)