RE: caller??????
Had a simular problem. Wife was caller, but not comfortable, plus she would not go out for practice sessions. So I built a device using a small digital voice recorder, mounted on a metal plate with micro switches. I can activate the playback mode and replay mode with another switch. I wear earphones and work the switches with my right foot. Down side, a good live caller can help with corrections, as needed, and my device just call the manuvers as I have recorded them. Pictures supplied upon request.