When we work with students, we often tell them that we don't expect them to hit the first 20 or 30 balls "better" or even as good as they were before, we just expect them to hit them "differently." Sometimes that "difference" is better, but often it's worse.
The difference is often (not always… it depends very much on what the change is…) an insight into how good a golfer can ever expect to be. You see, some golfers are just better at what @david_wedzik and I call "finding the golf ball."
Finding the golf ball just means that a golfer has that "something" that lets them hit the ball reasonably solidly even when not making their normal golf swing. For example, if I put the ball six inches closer to a golfer, or on a sidehill lie, or make them grip down five inches on their 7-iron, or completely change their grip… golfers who can find the golf ball will still, far more often than not, be able to hit the ball pretty solidly.
You can test yourself by doing some different things. Here are a few tests. Complete them all with your 6-iron:
- Hit the ball with just your right and just your left hand.
- Put three balls down about six inches apart and perpendicular to your target line. Address the middle ball normally, then try to hit either the outside or inside ball.
- Put a ball on top of a pencil (the normal kind, not a golf pencil) and hit it.
- Put your hands four inches apart on the grip.
- Make an exaggerated swing where you sway way off the golf ball and move your head a foot back on the backswing.
If you can do these things and hit the ball "okay" (you're not looking to hit the ball as well as usual… just on the clubface and occasionally solidly), you have the ability to "find the golf ball." That doesn't guarantee anything, but you are more likely to have a higher ability ceiling. Golf is still an athletic endeavor: hand-eye coordination, muscle control, proprioception, etc. are still important.
If you cannot, you can still be a great golfer, but you may need more time and possibly more determination/effort to improve, as changes won't take hold as quickly.