I did have a birth plan written out. I had also discussed everything with my midwife group, my mother, and my partner. However, the birth did not go "according to plan". It went much better!
Since it was my first baby, I "planned" on a long labor, and had made arrangements to use the birthing ball and a hot shower/bath for pain management. Since I live far from the hospital, they told me to come in when contractions were ten minutes apart. They started at 3 minutes apart when my water broke. By the time I got to the hospital, 1 minute apart and I was almost ready to deliver. I never had time to take a shower or even look at the ball.
Because labor was so fast and hard, my daughter inhaled a bit of fluid, so it was an hour before I could nurse her. That was the only thing I wished had happened differently. Everything else was perfect: fast labor, easy delivery, no drugs, and only two stitches. Sometimes nature gives us a better plan than the one we write!