Many Things. Relaxation/breathing techniques. A range of techniques call psychopropylaxis where you prepare mentally for the event so that you know what to expect and what your body's response is going to be and probably, most important, having a supportive birthing partner.
Lamaze and meditatio. There are many tools to help manage the pain of labor and delivery including massage, focused meditation, focused breathing, use of warm baths or showers, walking and different positions. A supportive partner to help talk and encourage you during labor is important, a doula may be available in some areas.