Try to prepare for practice and the real matches the same way, and have fun out there.
A lot of people look great in practice when they are relaxed and they are screwing around and saying silly things like "it's just practice".
But then when the real matches come they get tight and they sometimes obsess over every point, stress their partners out, and they look bad.
Either way just remember you're out there because you enjoy playing tennis and you want to win every point you're in.
Head YouTek Graphene Instinct - M:Babolat VS Black #59 X:Wilson NXT Black 17 #56
Volkl SuperGrip II Overgrip