The best thing to do is to start a picking thread without telling people what your capabilities are.
In this way, no one knows how good you are and the only thing you can do then is to earn people's respect by picking the winners from then on.
I can come here and say that I'm a 70% capper for 2009 myself and it is true too because I only wager just 10 games, won 7 and loses 3.
True story by the way but that doesn't make me good or anything. It just makes me lucky for that one year.