Like childbirth, you need confidence in yourself and you body's capability to nurse. Surround yourself with people supportive of nursing. If you don't know anyone, attend at least one La Leche League meeting before you birth your baby.
Hospitals seem to have breastfeeding classes, too.
You should have at least one breastfeeding book at home with you so you can get answers to common questions you may have. Again, if you have questions and you can't find answers, call a La Leche League Leader. Sometimes there are problems with breastfeeding. Some insurance companies cover the cost of a lactation consultant. Even if your insurance company does not cover the cost and you are having problems nursing, have a lactation consultant visit you.