Going short on margin is really no different to going long on margin( accept for the interest paid/received). If you're comfortable trading CFD's long, then I wouldn't think twice about trading them short. It's just a click of a button.
I trade long and short, it really makes no difference to me. Accept for the fact that we're currently in a BULL MARKET, so my positions are generally more bias to the long side.
Everyone seems to be getting ready for the "big correction"....
