I don’t think you can really say for sure until baby comes as they are all different.
Not helpful sorry!
My DS was an “easy” baby, as in never got ill, no reflux, slept, ate and poo’d pretty much for the first 6 weeks etc. I used to joke that I could tell the time by him as he just settled into a routine.
However I met 2 mums on maternity leave, we all had sons born within the same week, we where all really similar in our circumstances and approach to motherhood.
Yet mine was the mellow one, then we had baby O who never slept, had chronic reflux and drove his mother to the brink of insanity and baby R who was somewhere in the middle.
I think mentally to be able to do it alone you need the be really comfortable that yes it’s very very tough, but it might not be. So really really think about what your coping strategies will be if you had a baby who has high complex needs or even just a bit fussy.
I was the one funnily enough though who got PND.
Parenthood isn’t a one fit all job, it depends on what you get in the end, literally no amount of preparing will ever prep you for what’s to come.