I have had 3 home water births and am hoping for another in late April!
I found listening to hypnotherapy CDs very relaxing during pregnancy, and probably good birth preparation for you if you're worried about being tense after last times experience. By Maggie someone
I bought a TENS machine (have used it 3 times now so cheaper than hiring!) but boots hire them I think. I don't know how effective it is as my labours have all been fairly fast but its all I've used (am hoping to have a go on the g+a this time!). Take tens off before you get in the pool!
I bought my birth pool in a box from ebay, and I cannot tell you how nice getting in it is, the bath just isn't deep/big enough, esp for delivery - buying isn't much more than hiring, and you can sell on again if you aren't having more. If you deliver in the pool it makes tidy up after a bit easier, but DH has always done that. I had to get out to deliver the placenta last time.
For a pool you need to think about your hot water - if you have a hot water tank is it big enough to fill the pool in one go?
A friend got a prescription for meptid/pethidine from her GP so she could have it at the house but I've never done this. I have been offered the injection for the placenta (syntocin?) but never had it personally
I have always packed 2 bags - a me bag and a baby bag, so nappies,vest,babygros are easy to get to, and ditto for big sanitary towels (although I think MWs bring a couple, and some huge disposable absorbent mats) The MWs will take the placenta away with them.
My friend was v jealous of me having a glass of champagne when baby was 1hr old where as all she got was 'a plastic cup of anonymous brown liquid which may or may not have been tea' after her hospital delivery
And you can't beat being in your own clean comfy bed with a tiny brand new person snuffling in your arms [need a mushy emoticon!!]
Don't know if you're on facebook but there's a friendly group on there called homebirth UK