It depends on the "big boy." Go read Market Wizards. For the most part, from what I've seen, the real difference between them and small time traders is the businesslike approach they take, with a lot of effort put into risk management and information flows.
As for technical and fundamental techniques, they don't differ significantly from most traders in what they use, though they often have more thorough fundamental research because that stuff's too expensive for the average person to afford. But really, it's most important to understand the fundamental sentiment at the time and trade accordingly.
So, if you want to trade like a "big boy" you can. Just start thinking of everything in terms of risk and money management, because that's what they do. They have to because most trade other people's money.