Attempting to replace NPC/Companion face with my own

[dlai226]

I am currently trying to edit a companion's (Willow by llamaRCA) face with my own character's face. What tools/programs should I use to accomplish this? On the mod page for Willow llamaRCA posted this:

 

CUSTOMIZING WILLOW'S BODY MESHES AND TEXTURES:
Willow has a custom race, it's what keeps her looking unique in anyone's game, and she uses the Type3 Cali Body. If you want to overwrite that with something other than the optional files I provide you need to set up a file structure to do that in order to put her into the new body. It will take you only a couple of minutes to do.

You need to create folders for her meshes and/or textures depending on what you want to do:
1) If you want to overwrite her body meshes use this path and create the following folders (willow and willow race):

meshes > Characters > willow race

Inside the willow race folder put the new femaleupperbody nif

2) If you want to overwrite her textures use this path and create the following folders (willow and willow race):

textures > Characters > willow race

You can dump body, hand and face textures into that folder

 

But I'm not sure how to acquire the textures from my own character to do this. I don't have much experience using the GECK or FNVedit, but I'm willing to learn to accomplish this task. Thanks in advance for the help.