In preperation for my daughter's birth, I started to see a lactation consultant. I had extreme difficulties nursing my son, so I wanted to be prepared this time around.
I found out my nipples were inverted, thus leading to a difficult latch on. While in the hospital, the nurse suggested I try the nipple shields. You place the shield over your nipple, and the raised portion acts as a nipple over your nipple, giving baby something to latch on to. This also helps your nipple naturally come out from its inversion.
The first time I used this, was like watching a comedy of sorts. I was trying to attach it to my breast, keep it in place and hold my daughter at the same time. After a few uses, I started using my Lanolin cream as a glue to keep in place.
This nipple shield worked (along with my nipple guard). I only needed to use it a few days, until my nipples came out and my daughter could latch on correctly.