Nothing can truly self-induce labor, everything is essentially an old wives tale. Some women just get lucky that labor happened to start after trying whatever they tried, but that doesn't mean that the action caused labor. If "A" happens before "B" happens that doesn't mean "A" caused "B". Faulty logic.
When you are already IN labor, walking, rocking in a chair, dancing to move the pelvis, all these things can help a baby move lower and add pressure during contractions to help the cervix dilate more quickly.
Your body labors when it is ready. Hang in there. Best of luck.