Prepare your car by cleaning it spotless inside and out. Fix minor problems such as windshield wipers, floor mats or things like that. Take your car to a mechanic to see if it needs any work. He might even write you a clean bill of health. Take all your personal belongings out of the car so it looks neat. Maybe run a history report with a service like Carfax.com to show to potential buyers. Also, have the maintenance records on hand.
Determine your sale price. A good place to start is Kelly Blue Book (kbb.com). One owner cars or specially equipped cars may get a higher price. People like to bargain so you might want to inflate the price to give yourself a little wiggle room. Then advertise the car for sale in such places as the local newspaper, craigs list, local auto trader publications. There are numerous websites which will list your car for sale. Some people use ebay. If you do find an interested buyer from the Internet, make sure to use caution.
When people show up to look it over make sure they are licensed drivers, and hold on to their car keys while they have yours. They will probably offer you less than the asking price, and you can come back with a counter-offer that you can live with. Take cash or certified check.
Fill out the paperwork. It’s different in each state but your DMV can guide you through all this before you sell the car. If you owe money on a car loan, you need to involve the lender in advance, and they will help you. A convenient method is to make an appointment with buyer and seller and lender and take care of payment and paperwork there. You keep the license plates, and the buyer can use the bill of sale if police stop him. Don’t forget to cancel your car insurance.