Not really sure if this has been said before but, while modding with HxD editor, you can group the hexes together to help speed modding just a bit.
By this I mean if you click the "View" tab and go to "Byte group size" and pick "4" then the editor groups the hexes for you conveniently.
4 because it seems logical that the byte group size should instead of "1".
Before this I would make little mistakes where I would highlight and change more settings than I wanted so I hope this helps someone out there who's still playing and modding UGCW.