Ok, ive trained my barrel horse since he was three and is now 9. we took it considerably slow and easy with barrel training and about 3 months ago he started backing up, running ppl over who were trying to lead us in, and just flat out refused to go in without a herd of horses with him... all the while i say to myself "sack of Taters" to remain loose and relaxed, but he still seems to get nervous... any suggestions??