You do not need to remember everything before you begin. A useful guide can start with one phone number, one folder location, or one task that someone else would struggle to figure out.
Think of your guide as a conversation you are preparing ahead of time. If someone you trust had to help tomorrow, what would you tell them first? Perhaps you would explain who looks after the dog, which person understands the house, or where to find the insurance paperwork. Those everyday details are a good place to start.
Begin with three questions
Ask yourself: Who should they contact? Where should they look? What should they do next? Write one answer to each question. Keep each instruction short enough that someone could understand it while tired or distracted.
For example: “The home insurance folder is in the lower drawer of the study cabinet. The agent's contact details are on the first page.” That gives the reader a location and a next step without exposing a policy number or login credential.
Choose one category today
You might start with People to contact because it is easy to list two or three helpful people. Or begin with Pets & dependents if someone relies on your daily routine. Choose the category that feels most familiar, rather than the one you think sounds most important.
In In Case I Can't, categories help organize the information. Writing tips can suggest things to consider, but your instructions should reflect your own household. Skip examples that do not apply to you.
Make progress visible
Set a small goal, such as adding three instructions this week. Afterward, preview the guide as a reader. Replace vague phrases like “the usual folder” with names and locations another person would recognize.
Leave passwords, PINs, full account numbers, and other confidential information out of the guide. You can explain where properly secured records are kept without including the secrets themselves.
Your first version can be brief. A guide becomes useful through clear, relevant details, not through its length. Add the next detail when you think of it, and review earlier instructions as things change.