[QUESTION] Please help me figure out how to tweak body replacer meshes

[Bilgerat]

 Hey there, I'm a long time lurker hoping to learn more of Skyrim modding and maybe eventually become a minor contributor myself.

 

 So, in my quest to become a full-fledged modder I thought a good place to start would be some minor model edits. I've been using Leyenda's All-in-one UNP replacer for a while now, and I'm very happy with it, except with the genital parts which are a bit messy. I have some experience with 3d modeling and I can fix the weight painting and uv map myself. My problem is that I have no experience with Skyrim modding and have no idea what\where are the files that I need to edit.

Do I need to import just the nif? What about morphs? I tried tweaking UUNPSpecial.nif in CalienteTools\Bodyslide\Shapedata\Unified UNP, but when I loaded the file in Bodyslide (which is another thing that I still don't know how to use) it had no textures or sliders... so rather than keep going by trial and error I figured I'd first ask here.

 

TLDR

I need to know:

1) Which files do I need to edit to tweak my body replacer of choice.

2) how to correctly import everything into bodyslide\Skyrim. I could really use some advice, tutorial links or whatever. Please.

 

 

Thank you in advance.