A separate freezer needs a date; the refrigerator is a move-morning job
Count your appliances before you pick any date. A chest or upright freezer on its own cord is a second appliance and gets its own date. The ordinary fridge-freezer is one appliance on one cord, so switching the freezer off two nights early switches the refrigerator off with it and empties your fridge along with it. If that is what you have, read both paragraphs below: the timing comes from the refrigerator one, and the defrosting cautions apply to you as well.
A standalone freezer needs a date you choose, because nobody publishes how long one takes to defrost. GE's freezer moving instructions tell owners to remove the food, defrost and clean it, and give no duration. Two nights ahead is a reliable default: run the contents down, switch the appliance off, and leave the door open with towels underneath.
Never chip at the ice with a knife or a screwdriver. The lining is thin and there is refrigerant behind it, so a punctured freezer is a far worse morning than a slow defrost. Dry the cabinet properly afterward, because a wet cabinet on a truck is a wet floor at the other end.
The refrigerator is shorter work than people expect. GE's refrigerator moving instructions say to switch it off a couple of hours before the move so the evaporator can defrost, then remove the food, clean the interior, and tape down the grille, shelves, storage pans and ice bucket. On a combined unit that same couple of hours defrosts the freezer compartment too, so run its contents down over the final week and there is little left to melt. Keep it upright. GE states that French-door, bottom-freezer and compact models must always travel standing, and that a top-freezer or side-by-side laid down has to stand upright for the same length of time before it is plugged back in. If yours has a water line, shut the supply off and disconnect it the day before, or book a plumber.
Cold food rides in a cooler in your own car. The Danger Zone is the 40°F to 140°F band the USDA names, where bacteria multiply fastest, and the agency's guidance gives perishable food 2 hours out of refrigeration, or 1 hour once the day passes 90 degrees. In a Southern California heat wave, the second number is the one that applies.
Two boxes stay out until last. One is the nine-line kit. An open-first box is the other, holding a knife, a can opener, the kettle, mugs, dish soap and trash bags. Label it so you cannot miss it.