When I first flew on a Boeing 737 simulator, I was in a stress when all of a sudden I was told to fly that heavy aircraft under a bridge. I gripped the yoke firmly and was quite stressed with my eyes wide open.
My instructor throughout the one hour experience smiled and told me that a “plane is not designed to crash”. And that quote kind of calmed me down. Ahh great memories when I was an emotional child, I always remember this part ever time I take a flight nowadays, it calms me a lot.
Congrats for your first lesson! All I can say is watch your surrounding area when on the air and on the ground. Which means watch for the ground crew before the engine start, watch the aircraft when taxing and listen to what’s happening around you when flying. And follow the checklists! Even if your instructor will be flying.
I haven’t flown a flight lesson myself yet but I as a young adult I have a great experience flying every year with the Cessna (touristic and view point flights from a popular airport, worked along side closely with the staff for a week too).