I am so sorry it has taken so long for you to receive an answer. I am a registered nurse, but have done many of the same job duties as a medical assistant and have worked with many MA's in my past experience.
It is best for me to answer by giving your a little reading material which will follow below.
Quite simply, working conditions will be either inpatient or outpatient clinics. Your schedule will be 8, 10 or 12 hour shifts depending on where you work. Challenges will be the same for CNAs as for other healthcare providers: dealing with an overburdened healthcare system which is complicated by the bureaucracy of insurance carriers.
Now, the things that lighten these challenges will be: how you feel about your work, your relationships with patients and coworkers, and how supportive your managers and administration are towards their staff.
Please copy and paste these URLs into your web browser for further information:
I hope you find this information helpful. Starting your healthcare career as an MA is an excellent step. Just be careful in choosing your training program as many are "for profit" and can be quite expensive. You may qualify for grants/loans/scholarships.
Best to you!