International moves seem manageable in concept and exhausting in execution. The week-of-departure feels like a sprint. The week-after-arrival feels like decompression and discovery — usually both wonderful and overwhelming. The smooth transitions come from the 60 days BEFORE the move, when you systematically address all the small things.
What goes wrong without preparation: arriving with prescriptions running out, no working bank access, no internet at the new place, can't reach US tax accountant, lost track of which bills auto-pay, forgot to update beneficiaries, mail piling up at empty house, US property uninsured, etc.
Each of these is fixable. None of them is fun to fix from another country with time-zone constraints and unfamiliar phone systems.