What should a pregnant woman know before entering the delivery room?

Trust your providers. Your question is a wee bit broad to answer in 400 characters. In a nutshell, most of your care is provided by your labor nurse, anesthesia providers are your friend, your IV is there to save your life in case of hemorrhage, and your doctor or midwife is charged with making decisions in the best interest of you and your baby. You may feel a loss of control so you must trust your providers.