I've only had twins once so I'm not expert but this is what I did (or what they did I guess!)
Baby A- vertex. Birthed, held for a while, but I didn't nurse her right away because I wanted time before contractions started up again. Baby was transverse but I had a person on each side of me while birthing Baby A and they sort of maneuvered her into a better position. I was mostly ignoring them. After about 30-40 minutes they suggested I nurse Baby A if I was ready to start on the next. So I did. She nursed and immediately I started having contractions. I held her until I wanted to push (and yell!) and then I handed her off so I wouldn't scare her with my sounds.
She was born very quickly after that. I thought it would be more painful, after having just done it with baby a, but it felt rather soothing in all honesty. A bit like salve on a wound. I think the time difference was 47 or 57 minutes.
I held her for a bit and then my partner handed A back to me also. This was good for a bit until I asked them to check my bleeding. I had been chatting with a nurse who recognized my name and we were talking racing stuff/people/places, etc and no one realized just how much I was bleeding. So I had some help with the placentas and then quickly got some pitocin shots, iv set up for pitocin and something placed up my bum to help with bleeding.
I had feared being pushed to have them too quickly. The time I had was perfect for me. I dreaded having two more children. My birth plan was that the babies would be born and DP would take them. I didn't even want to hold them. Well, that all changed pretty quickly.
I pulled Baby A up to my chest and think I said "It will be okay. We can do this." about 50 times. It helped having a solid healthy 8 1/2lb baby to hold. The actual birth of the twins was far easier than the pregnancy or the labor.
As for the crowds. Yup. My other kids were born with a nurse and a MW. These girls had- MW who didn't have enough births at the hospital but was our MW, her MW mentor who I HATED and actually asked to leave at one point after she commented on my breath (after 40+ hours of labor mind you!
), the OB they worked with because I wouldn't go to the OR but was in a regular L&D room, two nursed for each side of my belly, a nurse for each baby, and a nurse for me (actually two because of shift change.) Oh, and the maternity ward director, because I was the first person to birth twins outside the OR. That's 10 people. Plus me, dp and then two babies. It felt like a crowd.
Really, if you've had other drug-free, vaginal births, this birth won't feel much differrent. But don't get me started on labor....