In this video, Darrin will walk you through how to install TNG version 9 as a new user. If you are upgrading from an older version of the software, you’ll want to look here for a video tutorial on that.
TNG Installation from Darrin Lythgoe on Vimeo.
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How about a tutorial for a newbie trying to add mods?
You might try the TNG wiki. For example: http://tng.lythgoes.net/wiki/index.php?title=Mod_Manager_-_Installing_Config_Files