There is one caveat to the idea of just reversing the motor leads. You can buy reverse props to use as pushers, that allow the motor to turn in the same direction as the tractor prop configuration. With the normal rotation of the motor, the torque of the motor against the drag of the propeller constantly puts pressure on the prop retention nut in the direction to tighten the nut. If you take a standard prop, flip it around, reverse the motor wires, and mount it backwards to serve as a pusher, that torque versus drag will put pressure in the direction to loosen the prop retention nut.
It will still work, but be sure to take measures to prevent your prop from coming loose in flight. If your prop comes loose, it may not come completely off the plane, but the motor won't be providing any thrust to keep your airspeed up. Additionally, some motors don't always do well running for any length of time with no load.