Early on a gangbang was one of my biggest fantasies. I think mostly due to poor execution, it ended up being one of those things I wished I'd left on my fantasy list as the reality just didn't stack up.
It was simply a matter of after doing all the work to set things up (I did everything myself) they payoff wasn't there. If I were to be able to do it over again, I'd have someone else plan everything and have it so that I could just show up and be the center of attention. Instead it ended up feeling like I not only did all the planning work but that when it came down to the actual GB it was less about all these guys pleasing me and more about me having to please all these guys.
I have shared my thoughts and advice on Gangbangs previously in these threads:
Gangbang Advice Gangbang Fantasy Gangbanged in front of hubby
You'll find some great advice and thoughts of others in those, as well.