Honesty Please on Nursing School

I have very little support and I have been discouraged. Over the last few years I have considered nursing school a few times but every time I did I convinced myself Im not smart enough, and my mom also tried to scare me away, basically she doesnt think Im smart enough. Recently, I decided enough is enough Im 32 going to go to nursing school, and I am smart enough! I have all my prerequisites except 4 classes. Im eligible to apply for nursing school now but Im going to wait until I finish the 4 classes this year and apply next fall. I wasnt going to tell my mom because I know she would try to shoot me down. Well I accidentally slipped and told her tonight. Sure enough she tried to scare me away from nursing school because its “really hard, and you have to be really smart” (I know its hard). She also reminded me that I have little experience in the medical field. I dont even know how to take someones bp. I have worked on the administrative side of the medical field most my adult life and VERY briefly worked as a patient care tech helping nurses in the NICU. I have taken medical terminology, nutrition, anatomy, lots of science classes and CPR certified etc over my years in college and have an associates degree(not medical) my grades are pretty average A, B,C types grades.

Im just worried again, I know experience in the medical field would help me in nursing school and I dont really have much. Maybe Im in over my head?