I would suggest you investigate the option of using a buddy box as opposed to swapping the TX. I tried to swap once and hated it as a student due to the fact the Training guy had to take his eyes off the plane to swap and thwn reacquire the plane. Those precious seconds are better used to recover the plane. With a buddy box the controls are moved from one to the other without the need to look around or pass the TX. PLease look at using a buddy box and cord. Your airframe will thank you.