The short answer
Start two to three weeks before the move. Schedule the old address to shut off the day after you leave, and the new address to turn on the day before you arrive. That one-day overlap is what keeps you from spending the first night without power.
The order that works:
- find out which providers serve the new address;
- book start and stop dates in the same session;
- file the mail forward and the address changes;
- confirm everything three days out;
- read the meters on move day.