Once set step in and repeat the preview in every detail. More importantly feel good about it. A preview should fill you with confidence. I have no doubt that if you give your putting previews your best effort everything about your putting will improve from your sense of feel and touch to your ability to roll it in from anywhere on the green.
Of course practicing ball position and wedge swings at the range isn’t exactly like launching scoring shots on the course. In practice every lie (or nearly every lie) is perfect. In actual rounds imperfect lies abound.
The other half is finding a route to safety that maximizes the reliability of the punch. Assess your surroundings. To make sure you clear any low-hanging tree limbs choose the club with the greatest loft that will still safely launch your shot below the trouble and reach the target.