I totally agree with TeachingPro about the hands having to be square at impact and rotate to a closed position after that. Perhaps my response was a bit short, I just wanted to stress the role of the hands rotating during the swing. Many people, especially beginners in golf, do not rotate the hands sufficiently and hit the ball with an open clubface. I'm not quite sure what is meant by the clubface having to 'point to the sky' when the club is horizontal. I think that the shaft should be parallel to the swing plane at that position (ie the butt of the grip would point to a line extending backwards from the ball) and that would mean that the clubface would not be quite vertical. Should anyone disagree with this, I would appreciate to hear from you.