It's also a great idea to warm yourself up before you go sarging. In one of Style's phone conferences, he said that a great thing to do is to call someone you enjoy talking to while you're on the way to your venue. If you start talking to anyone and keep a good conversation going, once you get into your venue you'll already be in that mode.
Along the same lines, I have a favorite song that I like to listen/sing to before sarging; Caress Me Down by Sublime. This song always puts me in an amazing mood, and by singing it (loud) in my car, I get my vocal muscles prepared to project. Try this out. Believe me, you'll feel amazing by the time you get wherever you're going.
And one final thing: from Style himself (same phone conference), for some people, shyness will never ever go away. Style himself even said that 90% of the time, before sarging he NEVER wants to go out and do it! He wants to do exactly what I did for a year, which is just sit around and wait for women to show up on his front door (not likely). And when he approaches any set, as I still feel to this day, there's that stupid voice inside your head shouting "go home, forget this and stay where it's safe." Once you accept that that voice may always be there, it's a lot easier to tell it to screw off and you just push through.