Already worrying that I won't cope with the sleep deprivation as I've been struggling with the interminable pregnancy fatigue!
You'll be fine! DC1 was a truly awful sleeper (woke every single hour of every night til well past his second birthday), and even then the exhaustion wasn't quite comparable to the bone-tiredness of early pregnancy IMO.
Re: continuity of midwife care - with DC1 I had a team of five midwives and was guaranteed (as close to guaranteed as possible) that at least one and probably two would attend delivery. I met three during my antenatal care (though almost all of my care was with my named midwife), so of course it was the other two who attended the birth.
They were all lovely and I didn't find it problematic that I'd never met my actual labour midwives until they arrived (1 hour, and 15 mins, before DS, respectively!). They did have a regular coffee meeting so you could meet them all though.