Recent father of twins here. To reiterate points 3-5: if it is within your means, I cannot highly recommend a night doula/nanny enough. We have a night doula who comes five nights a week (work nights, Sunday - Thursday) for the first three months (currently in week 7). After fending for ourselves every Friday and Saturday, I can't imagine how drained I would constantly be without one.

In a similar vein, I would suggest preparing by exercising. Being a parent of young kids is more physical than you think, or at least I thought. Carrying them while carrying other things, carrying gear, lots of bending, general physical awkwardness, etc.