I loved reading the birth stories on http://birthwithoutfearblog.com/ - even the births that 'didn't go to plan' are still written about so positively, it really helped me become comfortable with the idea of giving birth.
Other than that, antenatal classes were amazing, and talking to friends/family who had been through pregnancy/birth/babies/toddlers in recent times was super helpful.
Also - join the Due In forum on here for the month you're due in!
You'll be a fabulous mum, best wishes for your journey through motherhood