Can self-care & boundaries exist with a newborn?

I'm having a lot of anxiety about how bad the postpartum time is going to be. Weirdly, I'm not terrified of labor, which I was with the first pregnancy. Maybe that will come later, but I figure - there is a clear finish line, experience people to help me, drugs & interventions if I need them.

What terrifies me is everything after - going home to an endless time of no sleep, big responsibility, and changes that I don't know how to navigate.

I'm focused on the ways that I am uniquely set up to fail - I really like to sleep, I get stressed out by change, I have sensitive nipples, I'm too hard on myself (meta hard on myself apparently).

I have strengths too - I set boundaries & say no, ask for help & delegate tasks, and am diligent about my self-care. I no longer believe this is selfish or weak, since I am communicating clearly with others (aka considerate, not passive-aggressive or resentful or flaky), and I get good returns on the investment I made taking care of myself.

And now I worry that I won't be able to lean into this strength of self-care. I'll know that if I could just have a bit of sleep and a bit of "me time" I'd feel much better, but you can't set boundaries with a newborn. So I'll be in a bad spiral where my weaknesses are fueled by the mighty fire of a big change and big responsibility and my physical frailty and I'm not able to lean into my strengths of routine & self-care.

Maybe I need to give myself more credit.
I will know that it's important to drink water, eat good food and get sun time. I am ready to ask / beg /demand help and delegate. I'll know what I need to recover, and make it a priority, at least sometimes.
I'll still have to-do lists & organization skills. I can institute some routines if they help me feel better. The baby won't eat or sleep on a schedule. But I can still have a cup of tea around sunrise. Go outside, for walk or errands, around noon each day. Watch tv & play music downstairs during daytime feedings & play, and sit upstairs in the dark with a quiet podcast during nighttime feedings & cuddles. Lorenzo can give the baby a bath each evening while I take my own shower / sitz bath. A little bit of structure to the day may make me feel like a living person, and can help the baby get onto a routine when they're ready.

My weaknesses are real, but maybe I won't be starting in a worse place than any other mom.