Do not proceed before creating a
system image!
Sysprepping an existing installation with an OEM pre-installed Windows is risky. Manufacturers might have their own unattended answer files in place which ignore your custom unattended files. Anything can go wrong when sysprepping an existing installation, I do not recommend doing this.
If you decide to try it and it fails and you post about it, I will remind you about this warning asking you to restore the system image you made before proceeding.
Short:
Relocating Users folder with Sysprep should only be done on new, clean installs! Trying this Method Two, relocating Users on an existing installation might force you to do a complete reinstall or restore your PC to factory state.