something you might consider, contact the NICU unit manager and ask if you can shadow an RN for the day.....kind of like "A Day in the Life". That way you can get an idea of what a NICU nurse does, how their day works and also a preliminary idea as to whether you would fit into the environment personality wise.
I started in the NICU straight out of school, participated in a residency program that lasted 18 weeks and was both preceptor and didactic oriented and then was on my own. I still consider myself a work in progress....still learn new things often....and am continually amazed at how these little sweethearts have so much spunk!
I went into nursing school
knowing that NICU was where I wanted to be, but if you'd have told me that I'd be working Level III NICU at the county hospital in a large metroplex area, I'd have probably laughed at you! I love it where I am....the staff, the patient population and the caring atmosphere.
Good Luck on finding your niche.