Is it advisable to sell a car on our own to get a higher value instead of trade-in?

Hi KC Lau,
I would like to get your opinion on selling a car on my own instead of trade-in to buy a new car.
What will be your financial advice to me because in my opinion, selling a car on our own will allow us to negotiate for a higher price that we want instead of trade-in as the price of the car will be determine by the sales person based on the current market value. ?
I find that there is a risk in selling a car on our own because there is a possibility that the buyer may not pay after the transfer of ownership of the car.
Can you advise on what is the best way of selling a car on our own without risking it because I see that there is a financial opportunity here to receive a higher value for the car?
Thank you!