Required :
1) Copy all the files from "00 Required Core" to "Skyrim\Data\" and overwrite.

Optional:
1) Copy all the files from "10 Optional Hair\<Follower Name>" to "Skyrim\Data\" and overwrite.
2) Copy all the files from "11 Optional NoFaceWarpaint\<Follower Name>" to "Skyrim\Data\" and overwrite.