Even if you were a driver with many years experience, if you were planning to drive in your holiday, there is few things you must remember to secure your's and everybody safety. Driving in Bali is different from driving in America or Europe. Almost everything about driving is different when you drive in foreign country, including road track, mechanical differences, and even hand sign which is used by the driver.
Before driving car out of rental place, ask them if the car equipped with single or double airbag. Never let children under two years old sit in the front, moreover if the front seat has an airbag.
In wherever country you are, drive car defendsively. Prevent accident and anger in the road by avoiding reckless driver, especially in a crowded area. If you were pushed by other driver, or when he tried to stop your vehicle, keep driving until you arrive in a crowd and bright area. Then you can analyze the situation.
Request a car that can't identified as rent car. It's better that you're not recognized as foreign driver. When parking, keep all maps under the seat, and put precious and rent car equipment in the trunk so it's can't be seen from outside. Close and lock every door and window of the car. In the night, bring all your luggages to the hotel.