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Most RN programs require some form of volunteer work to apply, and if not, they usually involve some sort of practice in your first year anyway.
I'm not a nurse, but I do work in emergency services. My best advice? Be the kind of person who can be kind and patient, but who can keep some form of an emotional distance. Be able to walk away from it and leave it at work, or you'll burn out in your non-work life.
If you can deal with children with disabilities, you can be a nurse, just IMO. I personally found raising my autistic son to be much harder than dealing with the general public in their pain and misery. Whether or not you can survive in pediatric oncology, well, I think that is one of those situations that you don't know until you get there. That is probably the most heart-wrenching area to specialize in, I couldn't even pretend to imagine. I've not dealt with pediatric oncology but I've dealt with child sexual assault, and there is a certain amount of blanking-out that you have to do in order to do the job right. You have to learn to be a rock when everyone else is unstable.