I would agree that not talking to them about it would be the best option, but just in case you can't/won't do that...
For the friends going on about the pain, I found a good strategy was to point out how drastically different it will be to give birth at home and how these differences generally mean less pain or at least more manageable pain. These differences include the ability to move around and get in any position (I stood up during contractions to take pressure off my hips), having a support person or team completely focused on you (to wait on you hand and foot, rub your back, apply counter pressure on your back, etc.), being able to eat and drink during labor so you have energy to go on, having your own pool which many women find provides amazing pain relief.
For your mom, could she maybe attend one of your prenatal visits and ask the midwife questions? Mom's are hard sometimes. Although sometimes we have to shut them out, it's probably preferable to treat them like a DP and help them become comfortable to the greatest extent possible. A midwife should be able to explain (in detail if necessary) how emergencies are handled and how many emergencies they actually see.
Ultimately, remember that your peace during this pregnancy is paramount and whatever you need to do to maintain that peace is okay
