I've attended the ACPT in person every year since 2006 (Where did the time go?).
In those years I've met amazingly friendly solvers, constructors, and humans in general. If you're new to this, so was I once; and if you're nervous about difficulty or your own performance, I've made every possible mistake on a puzzle one can possibly make, and I'm still here and enjoying the ride. So no matter what, relax and have fun. You're not alone :).😁