You do what you need to do when it comes to school and work. I had to work while I was in Nursing School
. I had no choice. My bills weren't going to pay themselves. I also needed a car to get me from 'A to B' and it was nice to have some extra spending money. I worked an average of 12-40 hours a week while in school depending on the time of year. It was strongly encouraged by my Nursing Program to NOT work. I was bummed, but I wasn't going to let that stop me from attaining my dream of becoming a Nurse. I let my employer know well in advance what my school situation was. They were very understanding considering that they had several nursing students work there previously and currently there were two other nursing students (I waitress at an Italian Restaurant/Lounge).
Like I said, you do what you need to do. If you need to work to pay the bills, it's understandable. If you can afford to not work, then take advantage of it. Nursing School is very difficult and is going to require a lot of your time, effort, emotion, and patience. The way I look at it: If I can do it, then you can do it too!
Best of Luck!