One thing I can say is def don't wait until your water breaks to leave (if you're having contractions regularly). Mine didn't break until I was about 8cm when the nurse was checking me.
I refused EVERYTHING. IV, Epidural, Episiotomy, everything. The hospital can't force you to do anything you're not comfortable with.
I look at it as, the more intervention, the more complications. Like if they give you an IV, you'll wind up needing your water broken, then you'll end up with an epi, and then a section. I know that that's not always the case, but that's how I looked at it.
As far as your family thinking they NEED to be in the room, I guarentee they'll respect your wish to have them leave.
I, personally didn't care WHO was in the room, or who saw my who ha. I was in a trance. birthing mode! lol!!
You can PM me if you have any more in depth questions about going drug/intervention free!
Sarah