Finding the right personalized putting grip and then perfecting the right internal climate to let it go is a bit easier then you might think.
The difficulty has been following the pack and thinking that a generic grip should work for everyone. Obviously, watching the players who make their living on the course will tell you a one-size-fits-all grip certainly is not true.
By the way, if you could step into the lives of a few of these players you would find that they have been on quite the quest to discover the hold that's best for them.
Let me share a bit how we help people get a grip. (You will need a friend to assist you.)
Start by chalking a 6-foot straight line at home or on the putting green at the practice facility. Better to not associate this with a hole as we do not want to mentally attach to any outcome.
With your eyes closed, putt five balls about 8 feet with your partner observing and quickly picking up those balls so you can't see the results. Tell your friend where you feel each putt went even though you did not look to see which direction they traveled. You likely will have a consistent miss right or left.
Next, remove your left hand, placing it on your right shoulder to assist your square setup, and putt with your right hand only. Take the same notes as you just let the putter travel where it wishes based on your grip.
If these putts are not consistently on the line, then check your right hand as it just hangs from your shoulder at address. Adjust the right hand to complement this natural hang as you attach once again to the putter grip.
Repeat the putts once again and see if that does not naturally allow the ball to release on the line without thought or forced control of any sort.
You're searching for a hold and body setup that allow the putter to move where it pleases based on a tension- and control-free natural stroke.
When you find this you have found a good thing since we all desire to play the game instinctively and athletically without verbal commands. Do the same thing with your left hand as well, finding the right natural noncontrolling hold.
Finally blend both together without losing the discovered positions, and you're on your way to mastering a putting grip that translates into more one-putts.