The way it was explained to me was the following-
you've got to fully dilated in your first labour so your body is capable of it
we will be monitoring you more closely of course but that doesn't have to mean you won't be allowed to be active, get off the bed, use the swiss ball, your tens machine, gas & air
if things are progressing nicely (roughly a centimetre every hour) we will let you get on with it
It was really highlighted that I WAS capable of it, that it was understandable that I was nervous and they really appreciated that I didn't want to repeat the experience of my first labour-
to have to go for days having contractions first at home then in hospital, then being induced, then not dealing with the exhaustion which meant I couldn't deal with the pain which inevitably led to the cascade of intervention- epidural,catheter, diamorphine, synto drip (yeuch) then whipped into surgery for an emcs. Blah.
Nearly 3 and a half years after my first baby was born, I succeeded in my quest for a vbac and IT WAS MINDBLOWING ! Such a different experience from the first, I felt so much so much more in control, confident and trusting in my body, I was completely lucid and felt the rush of endorphins immediately the moment I saw my DS.
A lot to do with luck, I think, he was in a much better position (DD was posterior and had got distressed during that 72 hours latent labour, am sure she was as exhausted and pissed off as I was!)
Also a lot to do with the staff really taking heed of my birth plan- I made a much bigger deal of staying upright and active, they used the telemetric monitor so I could walk about, lean over the bed,they brought me heat pads for my back, they could do all this as was a smaller, less busy hospital.
I really recommend 'BloomingBirth'www.bloomingbirth.net the nicest book I have ever read about birth (and that is some claim)- factual but written in a lovely warm tone. The website is great too.
I hope this helps you !