I start nursing school in March, and I don't have a back up plan. I am very focused as well, and it's hard for me to stay on task I must admit. My father has always told me if you have a plan B, C, etc. Then you are already preparing for failure. I always listen to his advice considering the fact he has been a entrepreneur for 30 plus years. Just like me you sound very passionate about the nursing field, and that alone will drive you to succeed. I have children as well three girls, and for them I will succeed. I wish you the best of luck,and keep us posted about your journey :)