I probably should add, heal-toe on the street doesn't provide any major benefits to daily driving, unless you are trying to learn and practice for competitive driving. Mostly, it's just for the fun of learning the technique, and to have bragging rights to say you know how to do it. It might be good to know for steep hill starts when there's a car 6" behind you, but hill-assist does that job nicely for our cars.
In some regards, learning and practicing on the street is tough, because application of brakes, and timing/application throttle at downshift varies so widely with driving conditions. To me, seems easier during aggressive driving, but that's not always appropriate on public roads. It's actually seems more difficult when taking it easy, since all the actions happen much slower.
If you do practice on the street, make sure you do it under "safe" conditions. Especially at first, you may over/under apply the brakes, and over/under rev the engine. The result could be some jerky and unpredictable driving until you get the hang of it.
How do I know this? My 15-1/2 year old is determined to practice when I'm with him. I'm surprised I don't have whiplash yet.
