Hi,
i did hypnobirthing & the staff at qmh were very good about following my birth plan. the advice i got was to make it no longer than a page, otherwise they won't read it all. The midwives on both shifts took the time to read it & they told us what was def. possible & what was most likely not possible & gave reasons. they were open to me squatting, but they wanted to check me just before i needed to push, so i was on the bed & in the end i just couldn't be bothered moving. they are definitely more comfortable with the lie back, feet in stirrups position, but, as i said, they were open to me squatting.
if you want to use the ball, you need to do the 'training'. i didn't, but I got a letter from annerley (where i did the hypnobirthing course) saying that i knew how to use one safely. that was enough, so if you're doing private antenatal classes, just get them to write a note.
hope it all goes well