I was so unfit during pg with DS and I was worreid about that stopping me from having an active birth - but it didn't.
Read that Juju book of yours - the visulation and stomping helped me, so there might be somehting in there that you can try.
The shower was fantastic - and get DH to take boardies with him so he can get in there with you and get the shower head on you where you really need it at the time.
Remember the mw's in the bc are more geared to an active birth so they should suggest things during the labour to help (didn't really help me this time as wasn't in the labour ward for long enough, but with DD, the mw kept suggesting things like a change of position, getting in the shower, etc and it really helped)
I've lent my copy of active birth to dan's cousin but she's due in Aug, so will get it back and then you can borrow it if you want.
Believe in yourself - when I did pg yoga with DD, we were given a list of affirmations and encouraged to take a few minutes of peace every day (if Lachlan will let you!) to repeat them to ourselves, so i did it this time too. I've lost the list, but one of my favourites was along the lines of "my body knows what it is doing to birth this baby safely and naturally" or "my body is able to birth this baby naturally"