NO LONGER SUPPORTED!!!!
Seeing that I'm pretty much the only person replying in this thread I've decided to stop supporting the guide, as I don't think many people use it.
If you want a guide that is still actively supported, please check Neo's W3R: The Wild Hunt Revisited guide - it's a great guide of a very experienced modder.
Thanks for your time guys, it was a pleasure. Time to move on now!
The Return Of The White Wolf: Witcher 3 Modding Guide
RETURN OF THE WHITE WOLF
THE MODDING GUIDE
This guide's main aim is to make the game a better experience, improving all of the game aspects to make it more challenging and realistic, better scaled and prettier to play, while remaining friendly to The Witcher universe lore, including the previous games and the books. This part is very important to me, so you can rest assured that if you follow this guide, you'll get The Witcher experience as close to the books as possible and the one that will be realistic and serious.
Please be aware of your hardware limitations. If you are struggling to get the game running on Ultra/Uber details, you'll probably want to skip the configuration file modifications.
The guide will be updated with new mods and better tools as they are released, so expect a lot of changes until all the basic tools are released and modding scene for Witcher 3 matures. The game itself is also being updated and the developers are working on the bugs, with the updates being released every so often, so please also bear in mind that the guide is written for the specific version of the game and may not work with the future versions of The Witcher 3. I will make clear indication which game version is the guide for.
Another thing to note is that I am using GOG Galaxy version of The Witcher 3, not the Steam version, so adjust all the file paths accordingly if you use Steam instead of GOG Galaxy.
The guide is using step-by-method to instruct users how to install the mods. It's listed from top down and it is advised to install the mods in that order to make sure that all directions are followed correctly and no steps are missed.