Breastfeeding advice

So this may sound weird, but is there anything I can do to "toughen up" my nipples before birth so breastfeeding doesn't hurt as bad? All of the women I've talked to about breastfeeding have said that their nipples suffered the first few weeks. I'm wondering if there is anything that could lessen the pain for when the time comes? Putting lotion on the area during pregnancy maybe? I use bio oil on my belly and use the excess left on my hands on my chest area. Any advice on if that helped anyone before?