I have a white board planner that's huge and hard to miss lol, plus 2 smaller ones, the large one is above my pc and one is on my hallway wall and one is in my bedroom, and I back up all my "to do" stuff on my pc so that an alarm goes off to remind me what needs to be done and when.
I am really really forgetful and disorganised when I am not using them, I find that when I keep on top of updating them all then my life moves along a whole lot eaiser, the only thing is keeping on top of the planning gets exhausting after awhile and then I let it slip and it all goes back to pieces

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I even have to do lists for the kids, but again I can only manage it for a bit before I crack and feel mental exhaustion and get to a stage of being barely able to focus.
I have menu's created for each week in a month, so that I know what needs to be cooked, plus shopping lists to match each weeks menu.
Like I said, if I keep on top of it, it really works, it's just not the most natural state for me to be in, hence the crackery part.