Drink heavily. Just kidding.
Is the camera itself going to be a problem for you? (Don't let me asking that, make it a problem.) If it is, find a way to camouflage it. Are you using your own room? Or a studio room? Make your surroundings comfortable for you. More pillows, teddy bear, wall hangings. Be comfortable.
Be yourself. I actually don't watch film porn, because I never see sex the way I like to have it. I swear, for all the BS demands that you will see typed at you, you'll gain your own following if people know that that's YOU on the screen and not you trying to be someone you're not.
I hope this helps and best of luck.
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