A: To become a RN nurse you can either take ADN (Associate Degree in Nursing) or you can take BSN (Bachelors of Science in Nursing) degree. Associate's degree in nursing takes two years to complete while a BSN is more comprehensive and therefore takes four years to complete.: To become a nurse it is important that you complete a basic nursing program known as the LPN degree program. If you have acquired previous education in a non nursing field, than it is important that you first take classes for science courses such as anatomy and physiology.