This is my first attempt at making a mod for any game... this journey will now be filled with wondrous things :)

Simply extract rar contents, folder "modGeraltSidewaysEyes", into your Witcher 3 mods directory, if you do not have a mods folder in the DIR then create one.

Install: 
For Steam version "X:\Steam\steamapps\common\The Witcher 3\Mods"
For GOG Version "GOG Games\The Witcher 3 Wild Hunt\Mods"

Uninstall:
Remove the mod folder you extracted via the rar file "modGeraltSidewaysEyes"

Anyway, let me know if there are any issues or if you want me to try add something else.