I know that a lot of recent first time parents are gonna disagree, but babies are easy. They basically have two modes - on/off. When on all they want is to eat or be changed, with the occasional desire to be entertained*. Yes, this occasional desire will almost always be at 3:38am, but for the most part there isn't much going on.
We have been amazed at the simplicity of the Weer One, since the first time around we were more like "OMG SHE GRUNTED, WHAT DOES IT MEAN?!?!?!" as first time parents are wont to be. This time we are more apt to yell "Honey, where did we leave the baby?" across the house. The kid mostly chills out or sleeps and when she doesn't, it's feeding time. It's no wonder there are virtually no pictures of second or third kids as babies.
But as soon as we think we can coast for a bit, shit gets real. We tried to have people over for dinner the other night. We got chatting and they didn't leave until midnight, which unfortunately set off a cascade of "why did we do that", ending in the Wee One deciding that she was going to hit new heights on the Epic Tantrum Scale.... twice in one day.
When there is only the baby around it is possible to roll with the sleep deprivation by adjusting your schedule to sleep later in the morning or earlier in the evening, but Kid 1 sets hard boundaries on those times. It doesn't matter if you were up from 3:30 to 5:00, she is still getting up at 6:00 and there is nothing you can do about it.
We are surviving because we know there is light at the end of the tunnel, even if we can't see it yet. We recognize that the Weer One has thus far been simplicity personified and we're not taking that for granted. This is just an overly long and sleep deprived prattling way to say that overall the second is not nearly as life disrupting as the first, but thinking you can rush right back to being a normal person again is gonna bite you in the ass.
*Unless your baby has colic or some other issue, and to you I am sorry