Installing a font manually is something that I always used to forget how to do since most of the fonts that I installed I got through either yaourt or some other package manager.

Unpack the file and move it to the shared fonts folder

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$ mv font.ttf /usr/share/fonts/

Or if you want to install the font for a single user, move it to the .fonts directory in the home folder.

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$ mv font.ttf ~/.fonts/

You might also have to update /etc/X11/xorg.conf or /etc/xorg.conf with the new directory. Search for FontPath to find the correct location within the file to add your new path.

Now, reload the font cache:

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$ fc-cache -vf