Yeah, I have the same problem about women getting unrealistic ideas from my birth stories. But instead of telling beautiful stories of homebirth where the baby just "slips out"....I have 3 cesarean birth stories. It's not exactly the kinda happy stories you wanna hear when you're pregnant. So while I can't lie to my clients (sometimes I wish I could)... I say something like each birth is unique to each mother. Just because this is what I experienced, doesn't mean that this will also happen to you. But I try to play up the positive parts instead of focusing on the actual experience. Instead of saying my last birth was 60 hours drug and intervention free that ended in cesarean birth.... I say I had a beautiful LONG labor supported by my DH and doula, however, it did end in cesarean birth because DD was unable to drop. It was a truly empowering birth. I educated and surrounded myself with support and encouragement. I found out how really strong I am and that it is possible to labor as I wished (drug and intervention free). I feel I am qualified to help the mothers find ways to get themself through an unmedicated and intervention free birth (if that's what they want). I've heard moms say..."Well, my dr won't allow me to try for a VBAC". I am proof that you most certainly can try for a VBAC, but if you are birthing in a hospital, be prepared to fight for your right. They have to be committed to what they want, but at the same time, educated enough to accept help (drugs or intervention) if it becomes necessary. I usually end by telling them to learn from my experiences, and take it as
my experience and not theirs.
My first mom felt guilty because she got the epidural when she wanted a drug/intervention free birth. She told us "I don't see how you did it" (meaning drug free)..... I told her that it was my birth, and if my birth had gone like hers, I might very well have asked for that epidural also. What was important is that she made a good educated decision and in her case it was necessary. It was still an empowering birth even though it wasn't what she pictured.
Then my second birth I attended, the father blamed me for his wife's long (8 hours) birth. Her first birth was
very short, but because we had talked, I eventually told her how long my labor went.

I had worried that my presence (and story) might slow her down. There were other factors too, so I don't blame myself entirely. She was worried that the birth might only be 30 minutes, so that in itself could slow labor down.
I think you have to be truthful with the mothers in order for them to be truthful to you. If they feel like you are holding back something, most likely they will too. Motherhood contects us, not the birth experience itself. Even those that have similar birth experiences, the details will differ. Even pregnancies to the same mother differ from one to the other. So they can keep this in mind when labor does begin.