absolutely hated it worst pain Ive ever felt I stayed in bed for hours with that balloon finally got the epidural I was a 1 when it started but only 35 weeks so it took awhile.
They shove a balloon up your vagina and begin filling it with water, they then usually have you walk around until it falls out, once it falls out that means you're dilated to a 4 at least. It is very uncomfortable but you're about to push a baby outta there so a ballon of water shouldn't scare you.