Eating healthy while being a nurse

I am about to start a new job on night shift but I will start off training on days. I want to do this 3 month live fit program and my question is how easy is it as a nurse to eat on the job? Part of it requires you to eat 6 small meals a day, or every 3 hours! I am wondering if I should even start it now if I'm not gonna be able to finish it once I start working.