Yep.
First OTB tournament
Don't freak out when you make a mistake. Stand up, take a deep breath and look carefully. Often the losing move is two or three moves after you think you made a losing move. There are often hidden resources.
Avoid the situation of calculating variation A to D carefully but make an uncalculated move E in the end because it looks nice in the moment. Normally you see the refutation in the second you hit the clock.
Nope