I've gotten good at making separate systems talk to each other. But then a job comes along where a dozen moving parts all have to line up at once, and I feel the ground shift under me. I've come far enough to handle a lot, and just far enough to know how much can still go wrong.
More people experience this than they realize.
You can handle the normal jobs, but the big coordinated ones still throw you.
If this sounds familiar, the Library can help you find the bigger picture.