Yes, here are some recommendations: First, relax - you are panicking for no good reason. Dial down the nervousness, keep your wits about you, pay attention, and things should be just fine.
I've rented over a hundred cars (probably a lot more) while traveling overseas, from Morocco to Mexico to Australia to the Azores to Turkey to Japan to dozens of European countries, and other than occasionally less-than-stellar customer service (the same levels that I experience every day in stores and restaurants at home in the USA), I've never once had anything bad happen. No "discovery" of damage after I returned it, no disputes, no surprises, no flim-flam, no fraud, no overcharging, no cheating, no hassles, NOTHING.
And I have had plenty of positive experiences, and great customer service from car helpful car rental employees, and I don't think I'm one-in-a-million lucky. I am attentive, calm and careful, as any reasonable person should be when borrowing somebody else's $25,000 tool.
Sure, bad stuff happens when people rent cars. Bad stuff happens when you go to Burger King or Walmart. If you follow a few common-sense practices, you should be fine, and you can have a great experience. My specific suggestions:
1 - Be organized. You need to do some homework. Get all your car rental details organized, understood, documented and have a clear, specific plan in place long before you start packing your bags for that trip. The last thing you want is to just show up at some rental outfit and "wing it" when it comes to insurance, how you're going to pay, etc. Have your valid, current drivers license and IDP if needed (usually required by law in most non-English language countries). Know in advance about legal requirements for drivers and traffic laws in the countries you will be visiting.
2 - Document everything. Bring printed documentation of your rental reservation, your plan for paying for it, proof of insurance if you are using coverage provided by your credit card, etc. and have it all with you, ready to show if needed, when you go to pick up the car. When you have finished the ceremonies in the office (wave the credit card, show license, passport, whatever they ask for, then sign here, here, and there, initial here, here and there...), when you go out and see the actual car, go over it obsessively, with a fine-tooth comb, in good light (bring a flashlight, and use it), look closely at every inch of the car, for scratches, dents, possible scratches and dents, hints of any scratch or dent, bugs, dirt or other things stuck to it that might be interpreted later as scratches or dents. Look at all the glass, the tires and wheels, every piece of metal, plastic, glass, chrome, or whatever else it's made of - point to every single item you see or think you might see, call it out verbally and note them all on your paperwork. You should be going through this step with an employee of the rental agency, and you should both have a paper diagram depicting every surface of the car. Mark every real/potential/suspected spot on your paper, and look at the agency employee to ensure they are making similar marks to yours. As you do this, have your spouse/travel partner take pictures of each imperfect surface. Make sure that the agency employee sees you doing this, and that they clearly understand you are making a v-e-r-y thorough record of every flaw on the car. Allow up to an hour for this, do not rush through it.
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