The only thing I was adament about was *no episiotomy*! I was induced, and wanted to wait as long as I could before getting pain relief, because I was paranoid that it would slow the process down. The nurses misunderstood me and started praising me for "going natural". I was quick to remind them that they better have someone standing by with a needle if and when I ask for it!
The only part of labor that was hard for me was the transition stage. I was able to breathe through the contractions without much difficulty before then, but once I hit transition it felt like all hell broke loose inside. No matter what position I tried I was in agony from head to foot. Breathing did nothing for the pain and I was completely unable to focus.
I'm glad I went into it with an open mind, because I believe it ultimately helped me. Because I had faith in myself, I didn't assume I couldn't handle it and get the epi early. And because I wasn't afraid to ask for help later when I really *couldn't* handle it, when I got my epi the rest of my labor went smoothly. I was pushing about 45 minutes later, and felt no pain or discomfort at all while pushing. She was out in less than 10 minutes.
As long as you have a general idea of what to expect, I think you can trust yourself to make the right call as things progress.