You sort of anticipate that you'll be living your life + a baby, but the reality is that everything gets scrambled. Literally everything you used to be able to do - even apparently inconsequential things like 'go to the toilet' - becomes unimaginably complicated and difficult.
That's a bit overkill surely.
When you need to pee, you go and pee, and depending on whether they are awake and their age you either take them or leave them. If they are sleeping in you (and not in a sling) the choice is to wait, or try to put them down. It's not particularly complicated it difficult 
.
That being said, I don't think the OP appreciates the reality, so for her, here was last night for me and my husband:
I work till 2.30am as need to get extra hours in, so that if childcare goes tits up with Covid we have sufficient £.
Before I get to sleep, my 18m wakes. I haul myself out of bed but she resettles herself. I finally get to sleep at 3.
4.30 -18mo properly wakes this time. I try for about 30 mins to get her back, then hand her over to my husband, as it's his turn to deal with a prolonged wake up (my one the previous day was 2-5am). He takes her downstairs and I fall back asleep at 5:30. He manages to get her down and sleeps with her downstairs as that's where she's conked out.
7am, my 3 year old wakes me.
So that's 2 x1.5hr sleep. I'm working today. The tiredness isn't a newborn thing, it can last a lot longer. Me and my husband act like a team with it (he's fine to do childcare drop offs, I'm going back to bed for a bit and will have to work this evening to make up the hours) but you don't even get to share a bed half of the time. It's easy to bicker, especially if he turns into one of those men that thinks child rearing is a woman's job.