OP, you don't need all the answers right now. You are 5 months pregnant. Your 'answers' will go out the window once your baby is here anyway when you realise that these rules don't work for every baby. Just roll with it and do what is right for you and your baby when he is here.
We all think we have a vague idea of what parenting will be like before we have our babies, and then when you're in it, you will look back at laugh when you realise how far removed the idea is from the reality.
My first baby, once he got over the colic, was the easiest, most laid back, dream baby I could ever have wished for. I assumed it was because I must be doing everything right. Then along came my second and I did everything the same as I'd done with my son. But it didn't work. She didn't sleep...not even as a newborn (I'm talking about during the day when newborns are meant to feed, sleep, repeat). She couldn't stay asleep long that 10 minutes, she didn't feed properly because she was so tired, and she screamed for most of her awake time. I tried EVERYTHING. There was nothing I didn't try and I tried every possible combination of different things, I tried every bit of advice from other mums, books etc. But nothing worked with her. She would eventually conk out from sheer exhaustion at about 11pm and get a few hours but that was it. It wasn't until she 18 months that she finally settled down. But even now as a 5yo I still see this child that would rather do anything rather than sleep!
My point is that they are not robots and there is no one rule fits all. You are fairly new to Mumsnet but occasionally you will see hilarious threads from parents about what they thought being a parent would be like compared with the reality. They are very entertaining! And - I mean this kindly but it may come out as patronising - you are coming across as one of those all-knowing prospective parents who think they know what it's going to be like, and the majority of the other posters are people who have been through it and know that the reality is very different!
Good luck though and I hope you have a healthy pregnancy.