I know how to braid this way, it's not that hard.
And it's not Xandher who fails but Marko who is responsible for the mesh and uploaded it to TSR without texture.
My guess is that Xandher textured it this way because astandard braid would look silly with that mesh if the mes doesn't match the texure.
With this kind of braid there isn't that much structure to notice.
That doesn't make the hairstyle look good, but
the other one doesn't look any better.