Best way to avoid errors when customizing a mod?

[Jiro]

Hello,
If I want to customize a mod by changing around values or removing things, what's the best way to avoid breaking the game? For example, if I want to change Robots++ to omit the omnibot or make it so that the kitchen bot can only harvest, how could I be sure that it wouldn't mess something up, such as the tech tree?

[N7Huntsman]

That's a rather broad question. The best thing I can suggest is to have at least a rough understanding of the function of every piece of .xml or C# that mess with, and to test constantly.