Very nice, Linux will treat you much better than Windows will, Linux won't call you stupid ... or at least, it won't assume you are stupid
As for the editor, vi is my editor of choice, it ships with Linux (all of them, AFAIK).
is the command to open up the editor with (from the terminal). If you feel more comfortable with a program like Notepad, you could use Kate or KWrite, anything, just open it as root (type su to log in as root) and edit the place described in the linked post.
kate will open Kate and kwrite will open KWrite. Whatever you like
Edit: If you wanted to open either graphical editors, you must be in the GUI (KDE, Gnome, or similar) and you must have KDE installed for those two I mentioned. If you only have Gnome, you can go with gnome-text-editor, the commands would look something like this:
# kate /etc/X11/xorg.conf
# kwrite /etc/X11/xorg.conf
# gnome-text-editor /etc/X11/xorg.conf
The # indicates that you are logged in as root, you don't actually type it, for future reference.