Hi mitamitatu, I am currently in the ACNP program and it is all online. I have classmates from Nevada. You will have to find a ACNP to follow for our clinical hours. So far I have no complaints about the program. Thus far not as hard as nursing school. Lots of paper writing. The first 4-5 classes are theory, research, scope of practice, ethics. Then you get into the meat of the matter advanced patho, advanced pharm. It is not until you are halfway through the program until you do clinicals. I am only in my third class. I work four 12 hr shift a week an keep on top of school just fine. I hear it gets rough during clinicals balancing class work, clinical hours, and work.
If you are looking at doing a post masters cert you may want to look at Saint Louis University. I think there post masters are all online and look to be almost 10 credit hours shorter than GCU's post masters. http://www.slu.edu/Documents/nursing/PostMastersAdultNursing.pdf