You only need to apply enough heat to soften the adhesive so you can get a fingernail under the edge to peel them off. A hair dryer shouldn't produce enough heat to do any damage to the paint. My car is black, so it gets hot enough in the sun that I didn't need to heat the letters much at all. Your mileage may vary. Double sided tape should be available at your favorite automotive accessory store - I get mine at Canadian Tire.
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