Well I did Natural Family Planning so I'm a bit used to feeling for my cervix area. Basically you wash your hands reallllllly well, sit on the toilet (that's a good place, that or the shower where you can lift a leg) and put your finger in (I obviously use the longest one) and feel toward your bum. In pg your cervix faces your bum and then it swings mid-line and then anterior (toward the front) for delivery/in labor. So when you feel an opening, gently push up toward your tummy and see if you feel something that feels like super solid bone - that'd be the baby's head.

Don't know if that helps a lot... but that's how I did it. I'm about always a cm dilated (ha ha, the way of the multipara) but I'm too chicken to put my fingers inside - I do NOT want to break any bag of water or cause a leak or ANYthing.

~Julie