I would talk with your doctor first--and ask him/her about how birth plans are treated/received at your hospital. My Ob said that birth plans are mostly received with some hostility at the hospital, and encouraged me not to write one...I just told them what I wanted and what I did not want.
Some hospitals are really birth plan friendly- to ensure that a woman gets care individualized to her.
So Rose, I took your advice today and asked my doctor what the hospital thought of birthing plans - except I didn't see my regular doc today. I met with one of the other doctors in the practice who might assist in the delivery if she's the one on call.
I didn't really like the answer, though. She said they don't like birthing plans because they are superstitious.

And then she launched into this story about how she just delivered a baby and the mom had a birthing plan, and everything went wrong and she ended up with a C-section.
Now I totally understood her 2nd point, that they'd rather have me just communicate with them directly. I didn't agree with her reasoning, which was that when you put it in writing, then everything goes wrong. I'm wondering if she's Buddhist because her name is either Taiwanese or Chinese from what I can tell. One of my best friends is Taiwanese, so I've heard about some of their rituals and superstitions (though my friend is a believer now). I hope that doesn't sound weird; hopefully you know what I mean.
I told the doc, in a nice way I promise, that we will have a birthing plan, if not simply for our own reference. I think my husband & I both will be more comfortable with it so we have something to refer to. My question was more should we share it with the hospital or not. She said I should review it in my next appointment with my regular doctor so there are no surprises, which I totally have no problem with.
I guess the experience was a little discouraging. I'm going to have to find out if my regular doc is as superstitious as this one was, and if she's not, I'll be praying for her to be on call that day! I got a strange sense from this doctor anyways.