Probably stupid ftm question, would like advice

Ca

So I'm almost 31 weeks right now, and I have a couple questions. I'll be asking my doctor too, but I don't see him for a few more days and my curiosity is getting the better of me.

Question one: will I feel myself dilating when the time comes? What does it feel like if I Do?

Question two: sometimes it feels like my vagina aches, is that something to be concerned about? It doesn't burn or itch or anything, I've had no weird discharge, it just aches, like I'm having a bad period but I'm not.

Question three: is it okay I feel like I have no idea what I'm doing? I got a bunch of things at my baby shower and I have no idea what they're for or how to use them...i feel like an idiot. I know how to feed, clothe, and change baby and how to rock and get them to sleep and bathe them and whatnot, but when it comes to picking out bigger things for baby I feel overwhelmed...is that normal?

My husband is a firefighter and since it's fire season isn't home, hardly ever. This will change when baby comes, but for now we are relying on him for extra income.

If anyone can help me I'd be incredibly appreciative, and if you have negative comments, please keep them to yourself. By all means I feel ready to have a baby, and this was definitely "planned" in the way we were actively trying for a long time.