If you have successfully carried out the first three three steps, your opponent will have to carry out the fourth step. For every attack upon the weak pawn, your opponent will have to find a defender.
In the following diagram, white is still attacking black's d6-pawn with five pieces, forcing black to defend the poor pawn with five pieces.
If your opponent fails to defend the pawn adequately, look to take the target-pawn "with the little thing." What "the little thing" is obviously depends upon the position, but is often a knight.