I did the same thing- labored at home as long as I could, then completely natural birth at the hospital. Its so much healthier for you and baby! My best advice would be to try to find a natural childbirth class. Mine helped so much with knowing exactly what to expect, how to deal with pain without drugs, and when to go to the hospital-you don't want to wait too long! Just stay calm, and focused on breathing through one contraction at a time. Stress and fear make the pain much worse, which is why preparing helps so much!
Get a support system that won't push you into getting meds the first time they see you in pain. I banned the word epidural from my birthing room. I think I would have breathed fire if someone had dared suggest it. You could do something similar! Staying home as long as possible sounds like a great idea. That's definitely what I'm doing this time.