For changes that do not use "ESP", you can only change the face and hairstyle.
You cannot change the beard, scars, body, or skin color.

I tried to summarize it lightly.
Rename the node in the exported .inf file so that it has the same name as the original inf.
 
I am editing using "inf skope".
 
The important thing is that the number of nodes contained in the head mesh is the same as the number of nodes in the original mesh file.
 
However, since "0_HAIRLINE_Female_Human_Straight" of ks hair is combined with hairline, there is no problem as it is.
For non-unique NPCs, delete "0_HAIRLINE_Female_Human_Straight".
 
Make sure the exported mesh node has the same name as the original mesh.

-----Example of "Sigrid" id 000133476------
Eventually change it to something like this.
The left is MOD and the right is the original inf.