Pretty sure the anatomy class at our med school was designed to mess with our heads, it's like when on the first day of boot camp they make soldiers stay up all night...it's part of the initial breaking down process.
But really, it's just a class, it sucks, but you get through it. I'd give advice here, but I barely, I mean just barely passed anatomy. That hardest part was getting my own study method down (people gave me suggestions, but it didn't always work. I had to find what worked for me), some people learned better from going into lab, others focused on the atlases and never went near the bodies, others just did a **** ton of practice questions. It took months for me to find out what study method worked best for me, but once you do, it's just a matter of following through and sticking with it each day. So, I just wanted to say, don't feel too discouraged, and don't psych yourself out before the class even starts. Be aware that you may need to adapt study methods a few times before you figure it out, and so go into considering what study methods will suit your learning style and just get to it, and be willing to alter/adjust your studying if needed. And if you do bad, and it's difficult, know you're not alone and everyone eventually gets through if they want to.
Also, post exam parties are amazing! So you have those to look forward too. 😛