Speed is critical on long putts, how much your ball breaks depends on the speed that you plan to hit the ball
Keep your feet quite throughout the swing, eliminating sway and bad balance, just let the body take the feet where they need to go, left foot slightly inward on the backswing, right foot on its toe on at the finish with all your weight equally supported on a flat left foot
One of the clubs everyone needs in his bag is a utility wood, which is a hybrid between an iron and fairway wood