Take a practice swing before every
shot and actually hit the ground.
divot impact point* tell you where to stand.
Front to back and side to side.
Things change. Club
length, lie (uphill, downhill, side-hill). So remember,
a practice swing before every shot!
thanks to visitor Jim McDowell who points out:
According to the Rules of Golf on the USGA website - Section 1 - Etiquette
Damage Through Practice Swings
In taking practice swings, players should avoid causing damage to the course, particularly the tees, by removing divots.
I think you should clarify this on your website so that courses do not suffer.