The initial step to take to enable improving your putting is, get rid of the fear.
Don't be to show your putting skills because of a possible mistake.
Don't be insecure of what the other players may say, just centralize on you look.
Don't think of anything else, just put the ball in the hole.
Most mistakes are made when putting a short distance.
If you ball is just a few feet from the hole, just calmn down,
and think about how you are going to put the ball in the hole.
Focus somewhat on the mechanics of the shot, the speed , the angle
and decide whether the putt should should be hit with delicacy or hit firmly.
You should also imagine a line betwixt the ball and the hole and mentally calculate the distance.
Just imagine you are tossing a ball to a child, this should generate you a good feel for the shot.