How do I calm the constant fear that one detail will ruin everything?

You hold people's biggest days in your hands, and the fear that one small missed detail could unravel it all keeps you locked in constant overdrive. You never fully relax, because there is always one more thing that could go wrong. That vigilance is what makes you good, but living permanently braced for disaster is exhausting, and it is not sustainable. Here is what experience will teach you if you let it: something almost always goes a little wrong, and almost no one notices. The guests do not see your checklist. They see the joy of the day. Your job is not to achieve a flawless event, which does not exist, but to handle the small hiccups so smoothly that they disappear. You are already good at that. Trust it. Trade the fear for preparation, because they are not the same thing. Do the careful planning, build the backup plans, and then, when the day comes, trust the work you did. Anxiety and readiness feel similar but one drains you and the other steadies you. Learn to notice the difference. You cannot control every detail, but you can control how calmly you respond when one slips. That calm is your real skill, more than any perfect plan.