I learned how to race in a 911, long before drifting was the rage. Streets Of Willow is the kind of track where you need to steer with the back end and sometimes get both ends sliding to turn fast(er) lap times(although they opened the track up a little since then), but a lot of the POC's slalom courses were this way as well. I would argue just getting seat time on these types of courses would be sufficient, or maybe just getting a good instructor to ride a long for the first couple of times to show you how. As opposed to drifting, you're using sliding the car to get around the track faster, so you have to know when to use it, when not to, and how to transition from sliding to hooking up. Like I wrote, I had no previous experience driving a car on a track let alone a 911. It was easy to pick it up, as (at least with me) it's kind of instinctive to throw the car around when you need to, and with the 911 at least, it's easy to get it going and keep it under control, as long as you're either on the gas or on the brakes and never coasting.