I agree with everything said so far, I have read heaps of other birth stories on BB and even if I dont have a plan as such, I definitely know what I dont want:
I dont want the cord cut straight away if possible
I dont want the needle to help the placenta come out
I dont want to be restricted in movement\postions etc...
Alot of friends have said to me that whilst it is good to have a plan, it doesnt always go anything like you wanted or hoped.. being the first time, anything can happen!
Just arm yourself with knowledge and go with an open mind