Hugs it's not easy when your own personality is to like order & routine, children totally mess with that don't they.
My assistant told me that maybe this is my way of learning to just go with the flow. My idea of 'going with the flow' is not bouncing 24/7 (to soothe my gassy/crabby OT baby) and continually dealing with an OT baby! Not sure what else to do...
I think your assistant is partly right.
I think though rather than look at a whole day as being a mess look at a small chunk you can get to work & work with that. Many 4 week olds don't fall into good sleep habits, my DS1 was fantastic until 6 weeks & then it all went very very pear shaped, my DS2 was great here & there - I got told "one unsettled period a day, one unsettled day per week & one unsettled week per month & things like that helped me get through as I wasn't thinking "this isn't going to plan, I was thinking OK this is what it is like today, what can I learn from it. She may well be going through an unsettled period, or she may well be a spirited/touchy/grumpy personality & may never have textbook sleep, & I think that is the hardest hurdle when there are other parts of life to juggle other than the baby, sometimes something does have go give & sometimes that is that 'ideal' routine we hope for.
The thing I found with DS2 was that it all worked best when I said the only nap I was going to focus on was when DS1 was napping & bedtime, other than that, I just accepted what happened, basically I had to otherwise my children would be dealing with an even more anxious mother & that (I knew from DS1 was not good)
It's also really important to remember, she really is only tiny, she will change so much so quickly, just because she struggles this week, it could be because she is going through a growth spurt etc, but it won't be for ever, my DS1 is 11yo & If I could turn back time to having a 3week old (exactly 11 years ago) I know the one thing I'd change would be to be less concerned about tomorrow being like today, & more about accepting the moment.