What really is so hard about nursing school?

I realize the title sounds sarcastic but I mean it as a literal question tbh. I work as a receptionist in a nursing home trying to figure out what to do for a career. I considered nursing. But I've always heard, from people both irl and online that nursing school is extremely difficult. Like soul crushing stress that can make people cry sometimes. I've heard out of a nursing cohort, sometimes only like 10 people make it to graduation. I'm really wondering what it is about nursing school that makes it so hard?

I've heard people say the material itself is not really that difficult, but there's a lot of it. I know that could be overwhelming. But I guess I didn't imagine people would find it THAT hard to where some fail out, stress, cry, people say they could never ever go through school again, things like that. I've even seen people on social media say they have trauma from nursing school, maybe jokingly I am hoping they aren't serious.

This is for both LVN and RN school, I was mostly interested in RN. But being as I work in a SNF there are several LVNs around so I was curious about them too.