A successful player's swing is different from the two main aspects of ordinary player; both are correct, and grooved.
What do I mean by a correct golf swing? I mean that when the player swings the club with maximum power their body moves through a series of linked positions which enble them to control the club and thus achieve accuracy. Conversely, when an ordinary golfer tries to exert power they throw their body into incorrect positions and lose control and power.
A good golf swing is actually made up of a series of movements each of which positions the club correctly. It is this ability to make the correct body movements that allows the player to position the club correctly.
These different positions of the golf swing are not hard to achieve. The difficulty for most players is stringing them together and then keeping them together when they try to hit the ball hard.
If your golf swing tends to become erratic the moment you try to hit the ball hard you need to go back to basics. No, you don't have to start learning all over again, but you do have to analyze each position and make sure that it is correct.
Then, once you know that each position is as it should be, you can start to link them together into an entire swing. And that is what I mean by well-grooved. The linked-together golf swing repeats itself time and again, even under the greatest pressure.
When you watch a really successful golfer swing the club you will notice that they all have a routine. The way they set up to the ball is always the same. Their pre-swing routine is always the same. The actual golf swing always looks the same - except when they make a poor shot. Then you will notice that they look off balance and their body is often leaning over as they anxiously watch the flight of their ball.
The easy way for an ordinary golfer to achieve a correct and well-grooved golf swing is to develop a mind movie of their swing. Then, simply by running this mind movie every time you set up to the ball you will set your well grooved swing in motion.
This is what Jack Nicklaus always did.
You can learn how to do your golf mind movie and build your own swing by Google Internet search engine and type golf swing, where you'll find some sites will tell you how to build a strong and accurate golf swing that repeated even under pressure.