Also-your friends "horrendous birth" may not have been.
Not downplaying, but people have different viewpoints, approaches, expectations, and things tend to get exaggerated in the retelling.
For example I have a friend who recently gave birth. She was traumatised, had been told she wasn't built for giving birth, it was a horrible, long process, she thought she'd have to have a CS for failure to progress at one point.
Turns out she'd had an absolutely textbook, 1cm per hour, epidural, no intervention birth. 10 hours from first contraction to birth. It was just she hadn't done any research, and had been expecting to pop the baby out in about an hour or so. Didn't know about transition, dilation rates, stages of labour, so every hour the baby didn't arrive she was panicking more and more.
Apparently she thought I'd had a section for failure to progress too, when I'd been admitted to the labour ward at 9 am in very early labour and had a section at 11 am! (severe foetal distress on a routine trace = emergency section). We're close enough she knew I was going in that morning, and got the birth news about 12 noon...
However, it is your choice. One thing I found useful was to write a plan (mine was for vbac). I wrote a specific list of circumstances- basically I wanted to be able to request a section at any point if I felt I wasn't psychologically coping.
Have you thought about other options? Early epidural? hypno birthing? Look into it all first, as Six said a section is a big surgical deal, so make sure you've done your research.