Wow, I'm not really sure what is going on here; I feel that the comments posted have been somewhat negative and are not really addressing her question.
I, too, had my water broken with both labors. The first one was a hospital birth and the second one was a UC. In both cases, I stalled out in transition for hours and the baby's head just wouldn't make a good connection with my cervix despite position changes, etc. I had a stubborn cervical lip in both cases and I was just experiencing great pain without any break. Once my water was broken in both cases, I immediately got the urge to push and the baby's head made good contact with my cervix, pushing on that lip. It was a wonderful help. I understand this about my body and am certainly not opposed to employing this if my labor has the same pattern as my other two. My only regret with my UC is that I didn't ask my husband to do it earlier, as it probably would have saved me three hours of extreme pain at nearly full dilation(labor up to that point had been manageable).
My husband did it by using his fingers to guide some hemostats to my cervix and pulled on one edge of the membranes until it ruptured. This time, I got an amnicot from InHisHands.com, just in case.
Obviously, I would recommend leaving your water intact as long as possible--preferably until it breaks on its own. There are certainly risks that can be serious, and it should be approached thoughtfully and with caution. However, it really helped me tremendously.
Best birthing wishes!