Lots of pressure to make a certain grade to stay in the program (ie 75%, 76, 77, 78, 80, etc).
Learning to think like a nurse is hard--its called critical thinking and its a skill that has to be developed through taking MILLIONS of NCLEX-like test questions amoung other things...
Clinicals are not hard, but are stressful in different ways...(well, some people think they are hard--I guess it depends which one you are in. I have heard Peds is the most challenging.)
Clinical paperwork--time consuming and very thorough.
The time factor--there is never enough time to do everything that needs to be done--always feel behind.
The amount of reading is Hurculean.
Medical math, pharmacology, etc is VERY challenging.
My thing is that I dont find school "hard" I find it extremely "challenging." It is a sink or swim kind of thing. You either keep up or you flunk out...:0
I dont know how much more specific you want--really, you just have to experience it yourself--people seem to handle it differently and struggle with different things (excel in areas too--like me--I was told my paperwork was excellent, but I struggled with memorizing medical terminology of all things--lol).
I dont think I can explain it any better. You should do a search tho cuz this question is asked on a weekly basis around here!