I’ve never really been very “organized” about anything (those who know me a bit can vouch for this), but I’ve had to get crap done recently, so I’ve been forced to come up with some, uh, systems and processes.
Basically, the three ingredients I feel you need are reminders, lists and some keep-track-and-dump-stuff-thingie (the technical term for such things). I happened to pick on the default Reminders app, Wunderlist and Trello respectively for these, but really anything else will do.
Wunderlist is frequently used, mostly to keep track of recurring things to do weekly/monthly, and for shopping lists, or stuff that’s running out (no more bread? add it to the “Buy list”!)
Trello is lightly used, to keep track of both vague long home projects, and vacation planning, and a catch-all “miscellaneous” board with the standard ‘To Do’, ‘Doing’ and ‘Done’ stacks.
Finally, the basic Reminders app is most heavily used, since I throw in whatever comes to mind, even it’s something like “mail this letter”.
Nothing fancy, all free tools, and I’ve been feeling way less cognitive load for the last couple of months or so.