You plan a move or a long project and fill in missing details with reasonable guesses. Over time those guesses begin to look like confirmed facts because they have been written in the plan for months.
Mark the assumptions that could materially change the decision. These might concern available hours, access to a course or the likely cost of a service. Put the source and date beside any information you have actually checked.
Choose the next fact to verify
Start with the assumption that would change your plan most if it were wrong. Find a current answer through the relevant provider or person. Avoid spending hours polishing a schedule that rests on a basic detail you have not confirmed.
Revise the plan after checking. Some uncertainty will remain, especially over a long period. Leave room to update those parts rather than presenting the whole future as fixed. A dated note makes it easier to see which information needs refreshing when you return to the plan later.
