I have tons of friends who got into the school and transferred into engineering (it’s honestly a joke to transfer in; they let essentially anyone in as long as you choose classes correctly and do it early enough). I would say you have no reason to worry if you got into the school. I don’t know a single person who was rejected by the engineering school after being admitted.
I am pretty busy with finals so I can answer in more depth if you PM me in about a week or so, but I think Tufts isn’t too stressful in any way that other engineering programs won’t be. Don’t get me wrong, some of the classes are extremely difficult (in my opinion), but Tufts isn’t a cutthroat environment or competitive in any way. I have lots of friends who are willing to help out if there’s something I don’t understand, and people in general are extremely collaborative and supportive. It feels like the only person I’m competing with is myself, and it’s just because I have my own personal expectations that I would like to meet, and hopefully exceed.
I’d say your stress level will depend on you as an individual and how seriously you take academics. College can be as stressful, or stress-free, as you want it to be. I have friends who skate by taking the minimum to graduate, and I have friends who are pushing themselves and couldn’t possibly be doing more with their time. I try to push myself as hard as possible, but I still have time to go to the gym 5-6 times a week, I do research/work in a major chemistry lab at Tufts for 6 hours each week, and I’m studying one of the hardest majors at Tufts with a relatively good GPA. I think my GPA will definitely be going down this semester, but there are a lot of things that contributed to that.
Don’t come into college expecting all of the classes to be easy. Tufts has an extremely rigorous engineering program and it’s as demanding as other top programs. Engineering classes tend to have more grade deflation than A&S classes, but that’s kind of par for the course.
Also notable: I don’t have any AP credits, so I am starting off with basically no prior knowledge in a lot of classes and having to take every single requirement instead of having a credit in place of them. For specific information about majors/classes and stuff like that, I’d be happy to answer any questions you have.