Remember your first impressions of organic chemistry in undergrad? Everyone talks about how hard it is. One of the profs at my undergrad had on the first slide of his first lecture: "Organic chemistry has ended more medical careers than lawyers."
I worked hard, thought o-chem was insanely hard, but somehow, I managed to get A's in both sections. Then I take molecular biology and the two semester biochem for biochem majors courses, and only then do I realize how easy o-chem really was. It's on the MCAT, for God's sake. There is nothing hard on the MCAT.
Molecular biology was a very med-school-like class. Memorizing tons of bull**** with arbitrary names like "eIF2f", and what they all do... just because. And the biochem course was just a legitimately hard course. But I managed to get A's in those too.
The only thing hard about o-chem is:
1. It's different... stuff you've probably never seen before
2. It is the first class in the whole pre-med/science major sequence where you REALLY have to study. Kind of a shock to the system.
Anatomy is sort of the same way. You hear the horror stories, it looks intimidating, blah blah blah. Then you work hard and get through it easily. Then you move on to something harder, you step up your game, and get through that too. We are in CMBM now, and I am longing for the days of anatomy.
It's not that bad. It is not impossible. No school will make it so hard that you have to be a super-genius who never has any fun or sleeps, and spends every waking moment studying, in order to pass. Even when one of our profs started dropping embryology questions on our lab practical, it wasn't that bad.
Like o-chem in undergrad, anatomy is the first thing you're going to take in med school. You're adjusting to a new level of effort, and most of it is going to be new (even if you've had anatomy before... this is just different).
It's one of the easiest things you will take in med school. Just go in ready to work hard, and you'll be fine. You'll think its hard when you're doing it, only to realize later how ****ing easy it really was. Just go with the flow.