What Tyson said.
Except that the part about AWD being harder to drive is a myth. If you can shift a 2WD vehicle without chirping tires, it's no harder in a Subaru.
Basically, like he said, practice letting out the clutch at idle until you can smoothly let it out all the way with no gas pedal. Once you have a good feel for the clutch, you'll jsut sorta learn how to play the two pedals against each other to bring on the throttle as you reduce clutch spin from a stop, so you can take off very smoothly without taking all day. Then just get to know the shift points of your car. Sucks for you WRX guys up here; I can shift my RS at 2500 rpm
or lower all day long. I think when Scott and Nick have driven my car, they never got below 3000 RPM because they were used to their turbo cars.
Anyway, once you have the basics down, it's just seat time. The more you drive, the smoother you'll get.