Cal, just get a feel for the car. Once you build up the confidence your entry and exit speeds will start to increase. Use the 4wd to pull you through corners. Once you get a small bit of drift you know you are pushing hard enough. Your car will easily drift and slide, just needs a bit of provoking.
As for tail oot, the easiest way is to turn in to the corner under heavy braking, as the back end will be very light and will start to come around. Not recommended turning into Duffus tho'
Haunys in the Impreza are not a good idea, as you can do some damage. For that you should have come to the darkside mate, as there is a sensor on the handbrake from the VII onwards, that 'unlocks' the diffs, ACD and AYC to allow you to do this.
Enjoy.
...John