I went back to school to become a nurse and graduated the day after my first was born. I really enjoyed my job (I only worked PT), but felt that I couldn't stay on top of what I needed to know at work and still needed to be at home. I'm taking time off now to be home with the kids, but will be back to nursing some day! I always wanted to be an ICU or ER nurse, but since I was only going to be PT I didn't feel like I would be able to learn what I needed to learn and only be there PT. Instead, I worked on an ICU step down unit that still provided PLENTY of action. One day I was 8 months pregnant and sent 2 people to the ICU in the span of a half hour (we only had 3 patients per nurse) - like I said, we were busy.
I know that you have an interest in the critical care side of things, but go in with an open mind. You never know what you may find that interests you or simply that you enjoy and it works best with your schedule. Nursing jobs are so varied that you may find with a family you have to put off your ideal and get a job you enjoy but gives you what you need to be around for your husband and kids also.
Oh, and the woman who said be comfortable with bodily fluids was on the mark! In a hospital, or nursing home, setting you WILL see and be elbow deep in all kinds of stuff. One time a pt had diarrhea so badly that it literally turned into a river running on the floor - luckily not my pt! I was just helping with clean-up.
I did find that my nurturing side was a little zapped once I got home, but I really loved advocating for my pts. I tried to work it so that I would get home after the kids were in bed so I had a few hours to myself before getting up and being mom again. My kids were little (under 5) though, so that makes a difference too.
I think the best thing you can bring to this job is a caring attitude and a sense of humor. If you don't have those, you will crash and burn. Oh, and my favorite aspect of this career is advocating for my pts. I get a sense of fulfillment and pride out of doing this, and the pts really appreciate it. I enjoy meeting the pts also, but my least favorite aspect is having to deal with the families. That gets hard for me because if they are being difficult it takes away my time doing for the people that need me the most. With that said, meet every pt like a blank slate no matter what the off going nurse said in report. Sometimes personalities just don't mix, and if you walk into a room with no preconceptions about how the "difficult" pt/family will react, you will solve your problem 90% of the time.