What you wish you knew day 1

I hope you don't mind me starting this thread (I searched and closest one was 2007). I always see on SDN some sort of self realization of what med school really is. So I ask what you wish you knew going into it day 1 MS1 and please leave a tip.

I guess what I've heard rehashed so much is don't worry about preclinical grades and sitting in lecture is worthless.