Learning how to sell your car to the dealer is much easier than learning how to sell a car private party, because the dealer will take care of all the paperwork for you...Really not much to learn.
If you have a payoff, they'll even arrange to make the payoff and handle any notary services that may need to be done. If you have negative equity in your trade and they are buying it from you for less than you owe you'd need to come up with the difference though.
The major drawback to selling your car to the dealer is that you typically won't get as much money as you would selling the car private party. It's much easier however to sell to the dealer as there are some drawbacks to private party car sales that may make it worth it to take less money.
Hope this helps...