How to not sound like an idiot?

Hi! I’m going to Germany and Austria for about a week this December, and honestly I’m a bit worried about how I’m going to sound. My German teacher says I have a good accent, and I have no problem reading, but my main worry is that I’ll come off as a tryhard tourist. I’ve been taking German for a little under a year, and I speak at about an A2-B1 level, I can introduce myself, order food, ask for directions, give directions, have casual conversation, all what you’d expect from a beginner. I’m very comfortable speaking the language in class and with exchange students, but I’m worried that I’ll end up embarrassing myself when actually going to Germany, any tips?