I will more then likely be getting a mare soon. She has only ever been used as a broodmare though. I really would like to show her, as I think she would do wonderfully. However I have only ever trained my gelding & started with him when he was a baby. Are there any differences to training an older horse? Also are there any types of training that may work better for her? Ive also heard of clicker training, how does that work?