And if I were to be accepted, how would it affect my experience?
Junior year is hard everywhere but especially challenging if you are not accustomed to the rigors of a very selective BS. You would really need to hit the ground running – and you’ll have to adjust/fit in socially at the same time.
With that said, there are new juniors every year at BS - only a handful, but they make it work. A school will only admit you if you seem to have what it takes, so if you are interested, apply. Worry about how it would work only when you have an acceptance in hand.
I’m sure some of the CRH students here can give you some insights as well.