Natural Birth 2nd Time Around

With my son I ended up having 2 shots of diamorphine, an episiotomy and vacuum (assisted) delivery. I hadn't slept for 2 night before going into labour, and when I think back I think that played a major part in me having drugs to get through labour. I was exhausted before I even went into labour and I also had back labour.

I'm worried I'll have back labour again, but I really want a natural delivery this time round as I absolutely hated how the drugs made me feel (also hated being numbed for episiotomy as they got the wrong nerve - making me completely numb from the chest down). I already plan on delivering at an on site birthing centre (so it's within a hospital but I have to be moved for epidural or assisted delivery. I'm also hoping for a birthing pool so I can labour and possibly birth in the water (I read this is good for back labour especially).

Any other suggestions for a natural birth, potentially with back labour?