Hi there and first and foremost, wait until you're there to experience it, don't let other people scare you away from it.
1. I am currently a first-year ADN student in my 8th month of classes and yes, it is stressful. It is not anti-depressant stressful for me though. I have a full-time job, a 4 year old and a 20 month old as well as a hubby on top of nursing school and I am surviving. Nursing school is like no other schooling I have ever been through, it is very different in a way I can't quite explain. There is so much to do and it is crammed into a very small time-frame, but it is all very important and (to me at least) so extermely interesting that it is worth the stress. There will be times you will feel overwhelmed and times you want to cry, but there is also such a sense of pride with every thing that you accomplish that it makes you strive to do each and everything thing with as much heart and will as you possibly can. The teachers make it hard for a reason, people's lives are in our hands and we have to take it seriously, it should be hard. Don't let that scare you away, instead look at it as a good thing that they are properly preparing you for the world of nursing. The instructors aren't there to fail you, they are there to make a competent, caring and compassionate nurse out of you.
2. You will be as prepared as you can possibly be once you are finished with nursing school. I am in an ADN program and we have a ton of theory/lecture, but we also have labs where we practice actual procedures on incredibly life-like dummies and then we have to do huge amounts of clinicals at local nursing homes & hospitals where we provide patient care. In each class, the amount of care that we can give is greater because we have learned more. You will have tons of hands-on experience once you have completed nursing school that gives you a solid foundation for what you will learn as a nurse throughout your career. When you are hired into a specialty, most places do an orientation for a set amount of time where they teach you skills specific to your specialty area whereas nursing school gives you an overall basis of the entire nursing profession from gerontology to pediatrics and everything in-between. You are not going to be a 100% adequate nurse when you graduate, but you are going to have so many more skills and so much more knowledge than when you started that you won't believe it. They teach you skills, documentation, nurse-speak, hands-on, etc., it is truly incredible. As with any schooling, the more you put into it, the more you will get out of it, but you already know that since you teach. It's not like you go through 2 years of nursing school and don't know anything, don't let anybody give you that idea, it's just that there is so much to learn every day that any new nurse feels inadequate until he/she has had a chance to adapt to the world of nursing. Nursing is such an ever-changing field that we will always be learning new things and we will never be completely comfortable, but that is part of the appeal for me.
Don't let the schooling aspect scare you away, if your heart is set on nursing and it is truly something you want to do for the love of caring for people, then you will find a way to get through it, regardless of your obstacles. Take a deep breath, take the schooling day-by-day and relax and enjoy it. It is hard and it is like nothing else, but it is also incredibly enjoyable when your heart is in it.
Ok, enough ramblings from me now. Best of luck to you! Let me know if you have any more questions.