I wish to install NVIDIA-Linux-x86_64-331.20.run on Ubuntu 12.04.3 LTS (x64)

I was reading the article (URL is http://us.download.nvidia.com/XFree8...alldriver.html) and hope that someone show me how to do the following:

1. Exit the X server
2. Terminate all OpenGL applications
3. Ensure that all OpenGL applications have exited
4. Set the default run level such that it will boot to a VGA console
5. Disable the Nouveau driver

I am new to Linux; hence some handholding would be helpful.