Lord Ganesha is supposed to be the lord of new beginnings. He is the 'vighanashak' or the destroyer obstacles. He is also the first among Gods to be prayed to. No pooja or ritual can begin without paying homage to Lord Ganesha first. So on the day of your job interview, start by saying the Ganesha mantra. All you have to say is "Om Gang Ganapataya Namah".