The hardest thing for me is the fact that I speak my mind most of the time. The thing that you will learn in a BSN program is that most nursing instructors are a "breed of their own". They do things by the book, which isn't the way it really happens. I find myself realizing that my instructors are literally pissing the nurses off on the floor, because they're intense. You just have to go home at the end of the day knowing that you know your stuff, despite how stupid your faculty can make you feel at times. You sort of have to play the game, so to speak, if you can't do that then you're not going to get through the first semesters of nursing school.
Also, you have to keep up with your work, and really know that you want to be a nurse. I think most people drop out of nursing school at first because the first few semesters can seem practically stupid. You want to be learning how to do all the cool stuff, like IVs, meds, etc. Instead they teach you how to make beds and give baths...basically CNA stuff (no offense). It does get better you just have to stick it out. Like someone else said, most of it is busy work, but that's how a BSN program is different. You won't think you need it at the time, but most of the stuff I thought was busy work has come back to help me at times. Nursing school isn't hard as long as you have the motivation and desire, that's just my thoughts!