Remember that most bunts are sacrifices.
Sometimes that means the runner has committed — especially on a suicide, but even on a straight advance to 2nd or 3rd. So any time the play calls for the runner to go on the pitch, the batter must protect him if at all possible, by laying down the bunt. But, no surprise, the other team will know this if you give away the bunt too soon. And even if you maintain the element of surprise for as long as possible, you still need to make contact. (Not all bunts call for the runner to leave before contact, but assuming so will certainly help in training.)
The bottom line is, you need to learn to bunt against everything but a pitch-out.
Your confidence will build if your practice with this intent. And the better your bunt mechanics, the greater your chances of success.
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