Current CNA here. Bear in mind though that, as
@282NC suggested, many places like to see CNAs that were trained by an accredited program before taking the test. It's a pain, but it's already difficult enough to get a good CNA job (starting CNAs usually have to put in the time at nursing homes and the like before moving on to a hospital) and having that training makes you a more competitive prospect. However, others may have had a different experience and there are probably parts of the state where CNAs are in greater demand and a better job will be easier to find. That's just my two cents.
Also, if you haven't I'd recommend going ahead and getting your BLS certification when you can if you're interested in CNA. Only takes an afternoon and is required everywhere.