There are just so many different answers to that question - many I know do it by taking Yoga and meditation. Unprofessional actors do it with alchohol or drugs (ever try performing in a show with someone who's had a few drinks or his drug of choice right before going on? its NOT fun) Others work out (I like that one, along with the yoga) some pray (I usually do this just before stepping into the lights on stage at my first entrance)so I'm sure you'll find some way to calm yourself - try thinking of anything BUT whats about to happen - take your mind somewhere else, especially if its a place you love - that can help a lot...
"I don't really get the ending,all i can go with is when after several months,Judith saw Pat sang,and later she kissed him on the toilet,after that the story back to where Pat went down from the stage after he'd sung,and he went to the italian lady.I just don't get it,what Judith exatcly meant when he kissed Pat that she had seen,and did Pat end up together with The Italian Lady?Please help me,thank u very much!"
Quote from someone on IMDB in reference to a movie he/she didn't understand. Such grammar!