I used the it even if I didn't have sore nipples. It just keeps your nipples in good condition, which is what you want. Especially while BF.
Have you seen a lactation consultant to get some tips. I know in Canberra there is a 1/2 day or day stay you can attend and get advice from lactation consultant while feeding bub, usually its just you, bub and the consultant. This was a free service. I learned about one breast being your ontray and the other your main course, one is always faster flowing then the other, usually the smaller breast, which is your ontray. Just little things like that helped me understand how my breast worked which helped me feed my now 6yr old for 11mths.