Naturally inducing labor

How could you naturally induce labor that actually worked for you or someone you know? 1 1/2 cm dilated 80% effaced and -2 engaged..Just a bit more to go hopefully!! Any input would help im in so much pain and trying evening primrose oil and walking and bouncing on an exersize ball once I get off the ball I have painful cramping not sure if that is the baby dropping or not? Any input would be appreciated I NEVER get comments on my posts..