Renting a car overseas runs smoother once you know what the counter is going to ask for.
Book ahead of time, especially in peak season, since automatic transmissions and larger vehicles go first outside North America. At the counter, have your passport, your home driver's license, your international driving license, and the card used for booking ready to hand over.
Insurance trips up more travelers than anything else. Base rates abroad often include only minimal liability coverage, with damage waivers sold separately. Check what your existing auto policy or card benefits already cover before you land.
Walk the car with staff before you drive off and photograph any existing damage. Ask directly about fuel policy, toll handling, and drop-off fees, since these vary more by country than almost anything else.