Here is the letter, copy and pasted from the home birth website. it is the letter I used as a template and adjusted to suit my needs. even if you are not planning a home birth, it is a good one.
Sample Letter
(Your name, address and any hospital reference number should go at the top)
Dear Head of Community Midwifery,
My baby is due on (date) and I have booked a home birth under the care of the XYZ team of community midwives.
I am writing to inform you that I do not wish Midwife X to be involved in my antenatal care, or to attend my labour and birth.
I am very sorry for any inconvenience this may cause you, and really do not wish to create additional work for you or your staff. However, I feel that Midwife X does not support my aims in wishing to give birth at home/in water/standing on my head/whatever.
I am worried that her attendance at the birth might have a negative effect on my labour, and am not prepared to take the chance of this happening. I am also concerned that seeing her during antenatal appointments could make me anxious.
I do not intend to make any negative comments about Midwife X's skills; I am sure that she is perfectly competent and that she has provided wonderful care to many women. It is simply unfortunate that we do not get along/she does not appear to support home birth/etc..
I am sure you will understand that I do not wish to discuss this matter with Midwife X, or with anyone else. I would be grateful if you could arrange for another midwife to take over my care, who is supportive of my desire to give birth at home.
On a positive note, I met midwives Y and Z at previous antenatal appointments and was very pleased with the care I received from them. I would be delighted if you could arrange for either of these midwives to take over my care.
Yours faithfully,
A Stroppy Mother
***
As far as antenatal classes go, for several reasons I never attended any and was similarly clueless before my first dd. If I had this book it would have been all I needed to know. buy it, read it. I also did natal hypnotherapy at home and I found it very good. It is comparatively cheap and you can get them second hand. In fact if you are interested I am about to sell mine as my baby making days are over.
let me know if you want to pick my brains further.