Hex help.

[yungbol]

Ok, I modded Halo 3 using Hex Workshop or HxD, but all I did was search for identifiers and swap them. I want to further my hex skills to modify some other things such as other con gamesaves. How would I figure out the part of the game I want to change, basically where is it in hex?

 

For example... When people first researched modifying film clips on h3, how did the figure out to go 40 bytes (or however many) past the users GT to change armor. Thats basically what I want to do but in different games.