I would suggest becoming a CNA and "getting your toes wet" so to speak. I would recommend trying to get a CNA job at a hospital so you can see all different kinds of patients and work along side nurses. As far as prerequisites go, I would say A&P was the most challenging but still not that difficult; just keep in mind that it is different for everyone. As I said, I would recommend getting some experience first and at the very least see if you can do some job shadowing. Nursing school is tough and if nursing is not something you think you would enjoy, then I would not recommend this as a career for you! Try it out first :)