Some Common Problems Happened on Golf Swing
When you take a practice swing it is fairly easy to pay attention to what you are feeling during the swing. And since you're not going to actually hit the ball there is no particular demand on your visual system. These golfers may have a problem reproducing the positive features of their practice swings is that when they step up to the ball the majority of the awareness is now taken away from what the golfer is feeling and put into what they are seeing, anticipating or anxious about. To recreate the same thing that happened in the practice swing they would have to continue to pay attention to what they are feeling, as they did in the practice swing.
Whether it is the shift between feel and visual focus or just an overtaxed capacity for paying attention, the effect of this altered focus of attention is a host of common errors: trying to hit the ball hard in case you don't make perfect contact, tightening up all the wrong muscles at the wrong time, trying to "steer" the club into the ball, anticipating the result and looking up, and more.
If you have the specific problem of swinging too hard through the ball, be sure to swing as hard in your practice swings as you are going to swing through the ball. Again, this last suggestion is for temporary use; the long term solution is to groove the rhythm of your swing like a machine.
Additionally, you may find that players with high skill have the ability to pay attention to all the relevant information at the same time. Whereas the less experienced player either has not had enough time to develop those skills and awareness of the right sensations or, in the case of players who have been playing for a long time but are still functioning at a fairly low level of performance, they have never developed the fundamental skills and awareness to the point where these are automatic and, therefore, do not require much conscious attention.
In a word, to form a good habit in golf is very essential to your golf playing. If you want to develop a good habit in your golf swing, you have to pay attention exclusively to that one aspect of your swing until you become so intimately familiar with it that it no longer requires any conscious attention.