I'll tell ya anything you want to know about all 1 time I did it!
Trixie was assisted in whelping by my father for all of it and me for most. (Of course, he ain't no more experienced than me when it came to doing it ourself rather that being there for a mentor's whelping, unless you count God knows how much livestock he helped deliver
) We are co-breeders, I guess you could say. He owns Daddy Cody and I own Mommy Trixie. The plan all along was for both of us to be there. We we're "on-call" I guess you could say. About a week before delivery, we (me, Dad, husband) took turns so that someone was always there with her. When she went into active labor, Edward, who was NEVER going to do anything but help watch for pending delivery was there when she actually went into active labor. (Remember Prissy from Gone With the Wind? "Edward don't know nothing bout birthin no babies!") He called my dad who'd taken the day off and planned to be there around 9:00 anyway, but it was 8:15. He was there in 5 minutes, called me, and before I could make the 25-35 min drive home from work, she'd just had the 2nd one.
Then we were both there until about 7:30 the next morning when I went to work for 1/2 day and came home and then he went home to sleep!