I felt the same way you do before DD was born. In fact, my mom caused me sooooo much stress after DS was born, that I asked her to wait a bit before coming to visit after DD was born. As I got closer to my EDD though, I had a change of heart, and asked her to fly in about a week after I was due, thinking DD would probably be here by then. Well, she wasn't. And I was dreading having my mom in the house if I went into labor. Sure enough, my water broke the morning after she arrived.
Things this time went very differently. I don't know if it's because she knew she stressed me out last time, or because I felt more confident or what, but having her there was the best thing possible. She kept DS busy while I was having hard core contractions, and helped the MW out with whatever they needed during the birth (drinks, snacks, towels, whatever). The next morning, she took care of DS after he got up, and I was in hard core heavy duty labor. After, when DD was born, she brought me some home cooked yumminess, and helped clean up, etc. Having her there to meet her grand daughter 10 minutes after she was born was amazing.
So, as much as I was dreading the situation, it was the best thing to have her there. Never would have expected that, but happy it worked out that way. Not saying the same will happen with you, but it's possible.