How to trade a gun qustion

How would you go about trading a gun from one individual to another, like changing whos its registured for Im going to sell my p99 to my brother in Tennesee, do I send it to some one with an ffl over their straight from my house or could I send it straight to him, and then when he goes to pick it up they just change owner ship or how do you get a gun off your name???