RE: reversing a servo
general answer here..... the easiest way is to mount the 2 servos either facing each other or facing away from each other. with the servo arms in the same direction. (up or down). next thing to do if you have a computer radio is to put one servo on one channel the other servo on another channel.
if all that fails then id use a reversing y before i ever changed leads on a servo. servos are standard for a reason. mostly to pervent confusion down the road somewhere. always go the easiest route.