I'm taking one now-it's through MTecinc.
I have to tell you, I majored in English, and took Anatomy/Physiology and cellular bio classes in college, and have a huge interest in the medical field, and this is tough. There's so many grammar rules, and you need to learn word combinations, and type while listening to docs drone on and on.
I would like to quit, but my DH wants me to try to fight through and finish...it's not cheap, either.
If you can't type, it will be difficult. You have to take a test before you're accepted. It's a timed typing test, and you can't have many errors.

If I had my druthers, I'd go into radiologic technician courses instead. But I never know how my sxs are going to affect me.
Maybe you should try for a medical assistant course. It has some terminology, and you have to learn about charts, blood pressure, etc, but it might not be as difficult as what I'm taking.
Go online to MTechinc.com, or AHDI, which has a bunch of schools listed.
Good luck, and let us know what you decide.