You could also come up with things for them to do if they were bothering you:
I want a drink....

I need strawberries...

:
I need chocolate...
I need to vomit....oh watch out... :Puke that one got you...

:

So...with my first baby I met the assistant at my homevisit at 36 weeks. I HATED HER. My midwife could tell. She called her when I was ready to push...but before I started pushing...and said, oh she was only 4 two hours ago...it'll be awhile. She saved face for the assistant and for me.
Baby was born 20 minutes later. (3 hr 50 min labor first baby)
The assistant later told her: Wow, they must have loved you...doing the whole thing yourself. And my midwife said, nah, she did the whole thing HERSELF.

The second baby, my midwife shows up with the other midwife who I had never met...but I wasn't too bothered...my labor did stop a little bit...but when I realized what was happening, I just walked around, talked to her....got to know her a little bit...found out she wore birks...and there it was back in labor again.
It turned out that my dh was very tired from having moved us into the house 2 days prior...and couldn't be as much of a help as before. She ended up helping me so much. And...I had a small hemmorage and the baby was all wrapped in his cord...so I had both of them there: one for me, one for baby.
I hope it will work out for the best for you.
mv