I had a home water birth and Alex was my first baby! [My birth story is in my siggy if you want to check it out.] My reasons for a home birth were the same as yours - wanted to guarantee that I would be able to at least labour in a pool and ideally deliver there too. We decided on a home water birth at 35 weeks, so at least you've got a head start in terms of all your research etc. This forum wasn't here when I was researching, I would have learnt so much more had it been here!
Speak to your midwife as soon as you can just so she can come out to you and assess your house (just to check that in the event of an emergency, that an ambulance can get near to your house and the crew can stretcher you out - she won't be checking for tidyness and there's no need to get fresh flowers, bake bread and make fresh coffee!!
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At your chat with your midwife, she'll let you know what you will need to get in advance. All areas are different, and some midwives will provide more equipment than others (some may be able to hire you a pool, some will bring sheets - I had to buy my own pool, get sheets (cheap shower curtains), a torch, mirror (for checking you in the water)), so make sure you ask her what she expects you to do.
We got our pool from The Good Birth Company. We bought the Eco Birthpool in a Box (mini size). We bought the deflating & filling kit too and I think it all came to about £120? The pool takes about 2.5 times the amount of water as a bath does and with our boiler it took just over hour to fill. We have a combination boiler, so we were able to regulate the temperature of the water (it should be about 37 degrees). If you go onto the Good Birth Company's website, there's all sorts of info about how to set up your pool and things to check for.
Pain relief-wise, the midwives will be able to bring gas and air out to you should you wish to use it. I laboured with a TENS machine and used it right up until I got in the pool to deliver Alex. Don't know what I would have done without it!! Perhaps you could ask your midwife if your hospital hires them out if you don't want to buy one?
I attended pregancy yoga and felt that all the relaxation techniques during my classes really helped me to have an open mind for the birth - I feel it's all mind over matter. You could also get yourself a Hynobirthing CD - I used one for the last 4 weeks of pregnancy so can recommend that too.
My own experience was virtually text book: baby born on due date, no complications, relatively quick labour, coped well enough with the TENS with no need for gas and air. I would definitely do it all over again as it was so lovely to be in the comfort of my own house. The best bit was announcing the sex of the baby and knowing that I was the first person to touch/hold Alex was an amazing experience in itself. xx