>>1013178
>where you take each pose/pivot point and rotate/move until you get a good pose?
yeah selecting and moving/rotating/scaling bones.
There are little tricks, like with Rigify rigs you can scale the fingers to make them curl, or rotate / scale the mouth bone to make smiles, frowns, puckered lips; twist the lip corners to flex cheek muscles, eyebrow corners to furrow brow, etc.
Make sure you unhide all the important bones. Learn to use the asset library to save poses like face expressions and blend them together, even specific body parts and across symmetry. You make something good and keep reusing it in parts.
I don't have any tutorials, I am just trying shit and asking AI when I need help, it's like a personal tutor