If you are replacing the headphone jack, DO NOT DO THIS STEP! It's totally unnecessary.
When the instructions say there are tiny components on the underside of the cable, look under the cable once you've removed it to understand where/what they are. They are tiny resistor like components, where you'd probably grip with your tweezers trying to get this thing back in. Don't grip further in than the width of the cable that connects perpendicular to the plug. Otherwise you can try gripping (very very gently) on the U shape of this cable safely when removing/reinserting the cable.