Portugal is the corridor that's changed most.
Portugal is the corridor that's changed most over the last decade. D7 visa, NHR tax regime (now reformed), and the slow rediscovery of the Algarve and Silver Coast. Couples to Cascais. Retirees to the Algarve. Families to inland Alentejo.
NIF is your first piece of Portuguese paperwork. Free, applied for at any finanças office or via a fiscal representative before you travel. The move runs whether the NIF is in hand or not — but the lease, utilities, bank afterwards all need it.