The tech field is like that. Work won't be any easier. In fact, expect major libraries and build tools that are internal to a large organization to be less elegant and documented. Learning stuff like that quickly is a skill you're going to need.

I don't have a lot of advice besides "practice".

Well, I do have some. Don't be afraid to open up the tool's source and read it. Try to design the tool yourself and you'll get a better sense of how it's likely to do things.

But mostly, practice.