Didn't work for me either but think we are in the minority.
Went in at 11 days overdue for induction, cervix completely unfavourable, had prostin gel inserted, nothing happened.
Had double doses once or twice a day for 5 days (so approx 6 or 7 double doses) and still nothing happened.
Not even open enough to break waters and had very high bp and my hands had gone purple with carpal tunnel by this time so went straight to c-section at 16 days over.
All the other ladies who went in for induction with me went into labour that night - I could hear them all huffing and puffing while I was trying to sleep every night more ladies came in and went out and I was still there!
It is sort of like a smear when they insert it. I had to put my hands under my bum to get in the right position. Then you have to lie for half an hour so it doesn't come out. You have to have baby monitored before and after each application to make sure they don't get distressed
They said if I get pains to let them know and they would bring paracetamol but I never had a single pain.
They just try to get you 1 or 2cm open so they can break the waters and then they can get you on the drip.
Good luck - hope baby makes an easy and speedy arrival! xxx