The following link is a short film of a birth done at home in the water. Labour and birth are individual for each woman and when left in an environment that is safe a woman will be very instinctual.
Of course, there are times when interventions are necessary and the place you wish to give birth is not a safe option, however you always have the right to informed choice and consent within the environment you are birthing in.
This is a good basic video on how to do perineal massage if you choose to do it as you near the end of pregnancy
While not a necessary to do before birth sometimes colostrum harvesting may be recommended or you may want to. Below is a good video on what it is and what to do if you choose to.
A great video on how to use correctly