Yes, people do make mistakes; often. Airline pilots have long checklists of things they have to do before taking off, and more checklists for dealing with problems that inevitably crop up.

A doctor named Atul Gawande wrote a book named The Checklist Manifesto https://www.amazon.com/Checklist-Manifesto-How-Things-Right/...

Early in his career he did some research that showed that a simple pre-surgery checklist could reduce serious complications by more than a third. https://www.pbs.org/newshour/health/dr-atul-gawande-surgical...