It's physically taxing, it's exhausting, it's demanding, but it's not complicated. It's not hard.
Learning to let go of expectations, now, that is hard. I mean think about it. Almost every source of frustration in and toward motherhood is because things don't go the way we think they should. Motherhood is simple. Our flesh complicates it. Society complicates it. Expectations of how things should be complicate it.