A putting guide assembly and its associated method of use. The putting guide assembly attaches to the head of a putter. The putter head has a striking surface for striking a golf ball. The putting guide assembly is attached to the putter and presents a rod that extends forward of the putter's striking surface. The rod has a first end, a second end and at least one curved section in between those two ends. The rod can be rotated into different orientations while being attached to the putter. As the rod is rotated, the perceived curvature of the rod that is observed by a golfer holding the putter changes. A golfer can therefore selectively change the perceived curvature of the rod to match the natural curvature inherent in that golfer's putting swing.