I did this for one of my previous pregnancies and it worked just fine.
Step 1: Warm your nipples up using a damp cloth or gauze Step 2: Gently massage your nipples using either the cloth of your fingers. Step 3: Roll your nipples between your finger and thumb for several minutes Step 4: Rest and repeat
Don't be too rough and just a heads up, it may excrete some.colostrum...good luck :)
My husband and I were told to try it in the hospital for a non-stress test. Talk about the most unstimulating environment in the world. Needless to say, it did zero.