I've had good luck selling through a consignment dealer, they took a $1,200 fee per car to sell my Lexus and one of my Tesla's. For that fee they took all the pictures, submitted listings to all major sites, handled all the test drives (I had to make the car available as I chose to keep driving the car) and most importantly handles the sale and provided financing options to buyers, all I saw was a check for the difference between what I owed and they price I got (sans $1,200).. They also advised me on what is a best price to list it at to move the car, both cars moved withing 2 weeks and on the Lexus I got full asking price and on the Tesla I accepted $1,000 less (they told me if I wait I could get full price but my new Tesla was coming soon so I was motivated - still got close to $10K more than Tesla offered). They were even nice enough to give me another car to drive for a about a week each time after selling my car, until my Tesla was delivered - one time it was a Prius, next time it was a Lexus GS430h and a Camry (the Lexus sold so I has to swap mid week). All that said, I haven't done that since 2015, so this is a bit dated.