Hi Ben,
Welcome to the forum 
We’ve got a big thread with troubleshooting help for that guide which you can find here:
Can you give us some more information about the error messages you are getting? When you mention other scripts running fine, were you able to run every previous script mentioned in the guide up until that point? Or were these scripts you found elsewhere?
Those scripts worked when the guide was written so it’s possible it’s just a simple error like the indentation and spacing has changed or a text editor has changed the code slightly when it was copied, this happens from time to time with hidden characters added that mess up the scripts.
