hi Kingsroadie.
I had mobile epi and hospital birth for my first and home water birth for my second. The epi was great because I was making really, really slow progress (30 hours total) and needed the synotocin drip, and no way was I having that without the epi.
second time round I had doula and great home birth in a hired pool. totally different as it all went so quickly and DD was born 5 hours from first contraction.
My experience has taught me that if things are going very slowly and awkwardly, an epidural is great because it gives you the added strength you need, there is that point where you just can't take any more. Also, I was still able to push but couldn't feel a darn thing, did not feel crowning, had a very gentle birth and no tearing, which is unusual. however I was not very mobile. Very annoyingly, the tube attaching the epidural was so close to the wall behind me that I could barely get on my hands and knees, could certainly have not got as far as off the bed. so beware the 'mobile' bit, the main advantage is that it is lower dose so you are more able to push, disadvantage is that not all pain is removed, I was in quite a bit of pain.
However, if things are going quite quickly, I think you're better off without the epi. I found the waterbirth absolute and utter bliss, getting in the pool at 10 cm dilated was just such a relief and the pushing stage was genuinely fine, even though I hadn't felt the crowning before, I was able to cope with it and again, didn't tear.
So I would find out as much as you can and see how quickly things are moving. If the labour is going normally, I would try and manage without. I found the book by Ina May Gaskin very useful, called something like 'childbirth' (sorry can't remember the exact title', the idea of 'yes, it will be very hard, but you can do it', plus the idea that you just have to let it happen, you can't control it that much, you just have to give in to it, really helped.
sorry for waffling, good luck!