membrane stripping is where they do an internal exam, and where the cervix is attached to the wall of your uteris, they take their finger and go around it to remove it from the wall. it produces some kind of hormone that can make you go into labor, if your body is ready. if your body is not ready, it does nothing.
i had high blood pressure at the end of my pregnancy, so they tried to speed things up a bit. i got it done a week before i delivered (i was 1 cm), and after she did it i had to wear a pad b/c of the discharge, and then she did it again the day before i delivered(i was still 1cm). and my baby came 2 days before his due date. it kind of hurt a little but it wasn't bad at all and the whole procedure is like 2 seconds. afterwards i was a little sore but hey i was 9 months pregnant i just wanted to get him out of me