Sometimes my job feels an awful lot like detangling thread. Keep pulling until you reach some friction, isolate the individual components, figure out which pieces are causing the issues, correct. Repeat. Deploying new services (vs features) is often like this. I can’t say how many times a day my colleagues and I say, “Yes!! A new error”. Experience just makes it easier to identify the issues and isolate the pieces faster. And to not get discouraged or stressed by errors. Expect them - you’ll be a much better tester and will find bugs earlier (and hopefully before prod).