the right place - arch of your foot
Your ideal pivot point is under the centre line of your foot, just ahead of your heel pad.
if it's forward on the ball of the foot or back near the heel,
you will use hip and upper body rotation to help change direction. (Stand up and try it).
the right way - turn the whole leg
Turn your leg (all of it). The foot, knee and thigh should all rotate together.
whether you turn inwards or outwards, our whole leg must be relaxed (unweighted).
note: we hear instructors saying "turn your feet" all the time, but notice , if you only
turn your feet, it is really hard on your knees and your foot rolls to the outside promoting
skis to end up on outside edge, not what you want
the right time - when edges are released and legs are relaxed
"Do you pivot first or edge first"
the key is to not think sequentially because both are happening
all the time no matter where you are in a turn.
The easiest focal point is that moment you are about to
change direction, when the edge is release and there is that momentary
lightness and looseness in your thighs.
If you do it one leg at a time it creates a wedge before skis become parallel again.
how much you turn your legs at this point is up to you and the type of turn you wish to make -
skidded, steered, or carved.