Hi Wilkie!
it should be personal for you !
i didnt' dilate past 2 - 3cm in my first labour, which ended in a c,s
so all through second pregnancy, i did a visualisaiotn of my cervix opening and my baby coming down and out..imagined my cervix like a flower bud opening..although, it looks nothing like that,the image worked for me!
visualising a good , happy , positive birth, with you holding baby in your arms, hot, sweaty and elated is a good one for any mum to be!
i tended to do it in the bath , in semi darkness and quiet, if i could!
it worked for me, and gave me something to focus on and think about in a a positive way !