Just posted a 4th video. This one's on editing the XML files. Caveat here is that because XML is really just a text file, there are a lot of ways to edit them - what I show is simply how I do it (using Notepad++ - which is free - and Microsoft Excel - which is not, though free alternatives do exist).
Hope you guys find it useful!
https://www.youtube.com/watch?v=g8XguE1_7kM