You can feed just one side, certainly.
Every breastfeeding relationship is unique, so things may be very different this time By all means you can get in touch with the ABA - 1800-686268 - for a chat. Private practice LCs are also available. You can search for them on the lcanz website (just google it).
I hope you find the support and help you need to make breastfeeding work for you this time. Good luck! And good on you for preparing yourself so well. HAve you considered doing the ABA breastfeeding education class at all? That may also be really helpful as you get ready for your baby.