Non-Certified

It's not clear by what you mean about not liking the "pressure" of a classroom. Working in a medical office is not without "pressures". Although there are medical offices that may hire un-certified medical assistants, there may not be any that are willing to hire you without any "hands on" experience. Check the requirements of the medical offices in your area; and then talk to your sister to find out what steps she took. I'm sure you would not want to be the first patient that an MA gave a shot to; took blood from, etc. That is what you get from the clinical experience of a campus-based program and externship. Although CNA's learn some of the things that MA's do, such as medical terminology and some anatomy, you will learn much more in an MA program. You may want to think about if being an MA is what you really want to do.