As soon as the opponent deviates from the center line, then you can attack with such timing that recovery by the opponent is impossible. It is a laboratory where every possible reaction and counter-reaction is analyzed. It is a laboratory where every kind of force is experienced. The more failures you learn to overcome, the harder it will be for an opponent to win in the future. The first step to learning sticking hands is to learn the basic vocabulary of techniques which come from the sets.
Every technique has a specific function which depends on the opponent's reactions.
Try to master a few techniques rather than learning many in a mediocre way. As in other activities in one's life, there are often many ways of performing sticking hands incorrectly. Poor sticking hand techniques are characterized by sloppiness, stiffness, lack of techniques, being off-center, wobbly stances, no concentration, reliance on only speed and strength, uncontrolled hits, moves which are independent of the opponent's, inconsistent forces, and numerous others. The beginner student often relies on a few favorite techniques which are applied with great speed. There is a saying that the hand is quicker than the eye.