I think the key is to have a balanced life. You can't just study law all day and night, you have to sometimes go out with family, go workout, work, etc. I know you probably think this is impossible from the rumors you hear that law school is crazy, and it is to a certain degree, but if you can manage your time well, this will be your biggest savior. Everyone will tell you that managing time well is the key to survival in law school, especially your first year.
What helps me personally is, I am training for a triathlon for early next year. It's not a full on training schedule like 2 hours a day, but rather a 30 minute workout a day. I'm not going to be on the podium, but rather a "BOPer" but it helps me balance my life out a bit and helps me relieve stress, and helps me realize that life is not all about studying and law school.
You can always come to this board and get some pointers and help. Except for a few, you will get very sound advice.
Good luck and don't think about it too much. That's probably creating more stress.