What type of birth are you hoping for? There are different types of birthing classes... Bradley Method, Hypnobirthing, Lamaze, Alexander, ICEA... When it comes to medical procedures and interventions, as the patient, you are your number one advocate. It is up to you to be as informed as possible. As a medical provider myself, it is a HUGE pet peeve of mine when patients are not informed. It comes across as very ignorant when you are unable to make decisions.
When a patient says to me "well, you are the doctor, you decide" I always reply that I am only here to present the facts, risks and benefits but it is ultimately up to the patient to make any decisions.
So yes, take a birthing class unless you are already well versed in the stages of labor, complications, possible interventions and newborn procedures.