- I have an inbox. Everything I agree to do that I can't do in the next couple of minutes goes in there. "Buy dogfood". "Paint the house". "Do a thing for work". Everything.
- I triage the inbox and put starting dates on everything I can't do right now (like "buy a Christmas ornament") so that they'll show up on my daily to-do list when the time comes.
- I review everything weekly, add stuff I've forgotten, and delete things I've finished or abandoned.
And that's about it. Thing is, without this system, I can't and won't remember to do any of the things I need to. It doesn't matter how important it is to me to make sure I buy an anniversary card for my wife: I'll forget until it's too late. The above is how I walk the line between "letting my life fall apart due to disorganization and forgetfulness" and "wasting time optimizing a fancy process".