My second birth was awesome. It was harder and faster and I felt even more in control. I didn't tear as much with #2 as I did with #1 and that made recovery easier. My milk came in sooner with #2, so I got over that horrid engorgement period much quicker. (I'm hoping to nurse through pregnancy this time and possibly avoid engorgement entirely.) I was grateful I had my MIL come stay with us for a few days until the engorgement was over, she was able to deal with meals and watching DD#1 so I could focus on making sure DD#2 had her latch properly.
My advice for second time moms (and the advice I'll be following this time around) is to make sure you've got someone helping for at least a week after birth. This can be a family member (mother, MIL, sister, etc), or a post-partum doula.
I also highly recommend baby and toddler proofing the entire house as much as possible. There's nothing worse than nursing your newborn who finally got latched on properly and then watching your toddler pull out every DVD in the house, mixing all of them, and breaking several, while you have to decide if you're going to jump up and tend the toddler, or stay and give your newborn their first full nursing session. If the house is toddler proofed, or the toddler is at least contained in a toddler-proof area, they'll be much more content to play around you and give you time to focus on the baby.
Finally, meal-times are the hardest for me any time, but much worse with a new baby. I don't have the energy to think about what to make, let alone actually making it. It's so helpful to have some casseroles in the freezer ready to go, and healthy snacks and lunch materials already stocked. If you've never tried one of those places where you can make a dozen meals to freeze in only a couple hours... now would be the time to test them out. They are a bit pricey, but it's well worth it for the couple weeks when you're in that post-partum haze. Also, since most second and third time moms don't get baby showers... you could try to get someone to throw you a casserole shower or take a bunch of friends to one of the dinner places and have everyone chip in to get you two weeks worth of frozen meals.
I think I was back into a decent rhythm after the first four weeks or so... about the time I felt I got breastfeeding established. I think that if breastfeeding takes longer to get going, it'll take longer to find that rhythm.
Two kids are so much fun!! Especially when they can play together. I'm really looking forward to three.