Let's face it - luck is a huge factor in life and in birth. As anyone who has had a baby will attest, the birth rarely goes as expected. People may be disappointed if their careful planning is ignored, pushed aside, or forgotten at the birth. Of course one's wishes may be ignore, pushed aside, or forgotten without a birth plan too. Keep It Simple - If you want the busy labour and delivery nurses to read your plan its wise to keep it brief and skimmable.
Some people write a short letter, others use headings and bullet points.
Decide what is most important to you, and focus your plan on those points. This also makes you seem more reasonable and helps avoid overwhelming the staff. If you have so little confidence in the care you will receive you should try to find a caregiver and birth place that is more harmonious with your philosophy of birth. Be flexible - Birth is not a controllable process. The purpose of a birth plan is to think of your options and preferences in advance, not spell out what will happen step by step.