It's all very well to have the knowledge and the plan etc but there are many many factors beyond your control. By all means have an idea of what would be an ideal labour and birth for you, but it is just that because you have no idea how you will feel or how baby will cope until you're in that situation. I don't mean to sound negative and I'm completely for natural/homebirths I managed ok without an epidural (needle phobia also kept me stubborn) but don't be so rigid. In my experience working in the field, the dead set, planned to a letter adamant I will have this or that were the ones that didn't manage it, because they were so worried about not sticking to the plan that they couldn't relax etc and the situation would snowball. The ones that were successful were the ones who went in with an open mind, were flexible about what was happening and ultimately relaxed more. Staying calm is key, but that should include whatever you need to do at the time.