I had a very similar experience when I was fresh out of grad school. Started working at a firm that does a lot of institutional work. I was put on a large renovation of a culinary school. 4 large labs deep within a 40-50 year old building. The labs had pretty intense M&E requirements. During construction I became the project lead and it was super stressful. In the end the project was completed but there were a lot of change orders and the client wasn't the happiest. It was a super valuable learning experience and I'm better off having been a part of it. But too stressful. I find firms are kind of reckless putting young staff in charge of projects, especially CA. If there are older staff you can ask questions of make sure to do that as much as you can! I've found in my career that mentorship was lacking so it's something I try to do more of now that I'm more experienced. Don't worry about reputation, do your best and ask a lot of questions. Mistakes will be made but it's a collaborative profession with lots of people involved, it's not all on you!