Coffee: Those instructions are for "tricking" the system into thinking your custom fonts are the system fonts. You don't need those instructions for what you want to do.

If you just want to use a font in X-Terminal, you don't have to rename it. Just copy the .ttf file of the font you want to the /usr/share/fonts directory. Then reboot and go to the font dialog in the X-Terminal and choose your custom font.

If you just want to use the font in documents, make a directory /home/user/.fonts and put the .ttf file in there. It should show up in word processors, notepads, etc.