The vast majority of new parents settle their baby into a routine (which suits them and their baby) without any help. There is no need to have a maternity nanny (maternity nurses are not qualified nurses, thus shouldn't really use the word nurse).
As a maternity nanny, when I have worked for parents of a newborn - it has typically been when the family has had twins, as with 2 (or more) having an extra pair of hands around is a help.
I recommend: Secrets of the baby whisperer
Author: Tracy Hogg.
This will help you get to know your baby, when he/she is telling you they are hungry, tired, dirty etc. I prefer this to other books, as it is not strict routines, but more flexible.
Why do you feel that you want a maternity nurse at this stage? Are you going to work very quickly following your child's birth, or babies father is not around to help, no close family to help etc.
You could try going it alone, and then if you find that you get really really tired, then you could have a night-off by getting a Night Nanny to cover a night, or two. Would be a lot lower cost, than a full-time maternity nurse.