The original guide required you to manually patch problematic indices if they showed up. Plus, you would have to manually add the new skeleton into your char package. In addition, if you were swapping with an npc character you needed to manually add a header so the model's feet do not fall below the ground.
All of that can now be quickly solved with this fixer/injector. It will guide you through the index fix and it is able to automatically inject a proper header for npc meshes if needed, and even inject the whole new mesh into you char file, thus saving a lot of time.
USAGE:
The fixor is merged with the re-indexer through a single .bat file (.bat file by K0BR4).
All you need to do to perform a mesh swap is place the files you need into the corresponding folders, execute the .bat file and follow the instructions.
Once you finish, the resulting file will be ready to use.
You will still need to inject proper textures after the mesh swap is done.
You can refer to aman's guide to understand what this method is all about.
Bonus:
you can try the new look that K0BR4 gave to his .bat file if you want! Just place the file into the swaptool directory and execute it.