Since we all manage competition dogs, we should be aware of the relationship between our mood and how they perform. There is an old saying in the U.K. that the handler's mood travels down the lead. So make sure that you get to bed early enough. The night before a competition try to relax. Try and have a gentle run with the dogs, a warm bath and an early night.
Some handlers say that aromotherapy can also be very helpful.
Humour is the best medicine - try watching a few minutes of a favorite comedy tape or listen to a comedy tape in the car. At the show don't hang around with people who are congenitally depressing, find some people who are 'up' to talk to. Talk to yourself and the dog. Of course you don't need too much adrenaline and it may take you some time to get the balance right. Also the natural level of adrenaline will vary according to the 'level' of show that you are competing in - if you are at the 'Nationals' you may need to take some extra measures to calm yourself down to a 'normal' level.