CRNA schooling question

Hi, I am new to this site. I am a new grad RN working in ICU. I am highly interested in CRNA schooling. Had an opportunity to follow one for a week or so and that's when I really was fascinated by their work. What I would like to know is how tough is the schooling. i find that I am an above average student. Worked full time and went to RN school full time and graduated with 3.5. My strongest subjects are my math and science classes. I know that I would have to quit work to attend school. Just wandering how difficulat the curriculum actually is. Thanks