well, I'd like to share my experience of sweeps - I've had FOUR(!!) for the same pregnancy, and they have all been different, done by different people. First one at 40 weeks on the day was performed by a consultant in hosp, who simply said 'we could do a sweep and you will probably go into labour within 48 hours (loads of rubbish as there is no garantee) I didn't trust the guy anyway, he kept on talking about 'down below' when talking about my bits... Anyway, he could do it because wasn't 'ripe' enough. Got home and cried my eyes out.
Second time around, at 41 weeks, was with a young femail consultant, who was tinny and had very small hands. She tried to do it but her fingers were so short, and she was pushing so hard against the 'entrance' area iykwam and I screemed and then some stupid midwife said 'well what are you going to be like during labour' so I cried my eyes out when I got home.
Third time around was with my own midwife, who was great and explained everything and asked me to put my fists under my bum to raise the pelvic and make it easier for her to access the cervix.That was at 41 weeks + 4 days, I think, and she could do it but it didn't start labour.
I was induced at 40 weeks plus 14 days, and the consultant on the ward did another sweep beore putting the proctaglandine (SP???) but I don't know if it changed the outcome at all.
Moral of the story, I guess: it can hurt, if you don't want to do it just say no, expect some tears because it can be invasive and dissapointing, and get it done by a nice midwife instead of a consultant!!!