I've been doing that with my house as well. Every year I end up trying to rediscover some mundane task like - how do I remove this darn window screen with these hidden latches. So I'm trying something new:

I write up a google doc with some pictures. Then I make a QR code of the url and attach it. I've done it for several things:

  - how to put the air conditioners in the windows
  - documenting the water filtration system
  - documenting the septic system
  - documenting the propane fireplace
  - documenting the network wiring