S.M.
I started using the Lansinoh brand of lanolin cream about a month before I gave birth, and it didn't help "prepare" me at all. Once my son arrived, I couldn't live without the stuff! I'd say wait until you start breastfeeding at the hospital, and they can give you some free samples while you are there. If you like it and want to keep using it, you can get it at most drug stores after you run out of the samples.