Don't forget to tilt the drives up.
Bunk trailer or rollers?
Don't sink the trailer, just get the tires wet to the axle. See if it is floating at all. Start the motors, put in reverse then have your wife slowly bump it down the ramp with the brakes.
Don't forget the drain plug.
Just don't look like a tool doing it for the first time. Don't unhook the front hook until you're ready to go off the trailer, especially if it's a roller trailer.