I had a VBAC in Aug 05 after an elective for breech in Jan 03. I read all the old threads on here (hi Ellbell - recognise your name!) and the AIMs site, UKVBAC, and some great links mears posted.
I wrote an overly detailed plan which boiled down to no interventions on a 'just in case' basis. So I refused a cannula (even though they waited until my dh went to get the bag from the car to wheel in three doctors to try to persuade me again). I said I wanted to go straight to section if things weren't progressing, no syntocin or ARM.
I agreed to baseline monitoring, on the understanding that if everything was fine the monitor would come off after 30 minutes. dds heart was fast and so I agreed to keep it on. It kept slipping out of position and the staff didn't seem to bothered - that is they didn't rush in to replace the leads.
I had SPD, so limited mobility anyway, but felt very strongly that it was up to the staff to make their machinery work with my positions, not the other way around.
I didn't even see a consultant during my pg (fobbed off with locum SHO) and during my labour, the consultant anaesthetist dropped in, but no one else. If any senior (more senior than a new SHO...) doctor had shown concern, someone who knew what they were talking about, rather than the 'well this is the protocol, even though you don't need a drip now, Mrs X', I would have listened to them.
I think the key is to be clear what you want and to accept that it may not go to plan. My birth plan was written more for my dh's benefit, so he had something to refer to.
I went from 5cm to pushing in under three hours and my mw said that even in women who haven't laboured before, the cervix 'flips' open in second pg. I don't know how general this is, but it was all much faster than I was expecting!