Let off the gas and steer where you want to go . . . it really is that simple. Letting off the accelerator is more-or-less equivalent to pushing in the clutch. I've never (well, hardly ever) had trouble recovering from a slide in an automatic, and I've never really practiced it except by accident. Anyway, if you are sliding regularly in snowy/icy conditions, you might be driving too aggressively or you might just need snow tires.