I have major decision fatigue after decluttering my daughter's room. Every single item (over 600) had to be assessed, and a decision over whether it was rubbish (and then which bin - trash, recycling, compost, glass), usable donation (and then where - op shop, friends), other (metal recycler, textile recycler). Exhausting. I have finally finished running around to the various donation centres with several full boot-loads! So what I estimated to be a day's worth of work turned out to actually take us around a week.
We just have to go through all the makeup (several boxes), this evening. What proved useful was corralling all the like objects together while we were doing it (Marie Kondo-style). So we put all the hair care stuff together (most of it went), makeup, stationery (journals, notebooks, so many notebooks! pens, etc), personal papers (1 folder for everything), childhood stuffed toys (they all stayed), knick knacks (95% gone - yay), books (lots moved out of her room and on to the communal bookshelves). Then we could take our time sorting them all out one by one.
I have booked myself a solo retreat for a couple of days, just to sit in someone else's serene, peaceful space and not make any decisions, apart from where and what to eat!