I just attended my first fair at UNI and took a great position. It does you no good to be anxious and will not help you to think clearly when you have a decision to make. This is a big deal, but not a life or death deal, so keep your prospective and enjoy the whole thing. Talk to recruiters in the elevators, be friendly, don't worry about wearing the perfect interview clothes, try to get some sleep each night, talk to other candidates (they may put you onto the perfect job, one they don't want). Don't come late and leave early. Commit to the process with good humor. Enjoy! This is life.