The key thing is that (amazingly) it's different for everyone.
For example, while I was tired with my newborns, I never experienced that mind-numbing exhaustion some women do, and mine were luckily fairly good sleepers within the bounds of babyhood.
However, I really struggled with a sense of discombobulation with my first. Like my world had been upended & I had no one to explain it to me.
Equally I found having 2 DC fine - easier than 1 - but when I had my 3rd in 4 years I really struggled. But others have had a completely difference experience.
I, too, find the teen years I'm currently in, the hardest - and loveliest. I enjoy them greatly as people & yet am driven to utter despair & exhaustion dealing with the daily realities of teens being selfish, not listening, upending my house. I've never felt such bone-crushing exhaustion, physical & mental, as I have in these recent years.
There's no way to make each individual experience relevant to all mothers.
I remember late in my first pregnancy a friend who'd had her first about a month before coming to visit me. She went through the (horrific) details of her labour at length. It didn't put me off at all - rightly as it turned out. My labour was short by first labour standards, not easy but manageable & straightforward. But equally me assuring other women there's would be like that would have been pointless.