Next, you'll need to remove the insulating outer layer by stripping it off the internal wires.

Use your pliers to grip the cord near where you want to start your strip, approximately 4 cm from the cord's end. Then, use your cutting pliers to carefully cut through the outer insulation about 2 cm from the end of the cord, taking care not to cut the wires inside. This can also be attempted with a knife or scissors.

Next, firmly but gently grasp into the incision you've made and pull the insulator off. Again, take care not to squeeze too tight or you may cut or rip the wires inside.

If you do accidentally cut all or some of the internal wires, it's not a big deal, just make a clean snip a centimeter or so below where you were stripping from and start this step over.

More thorough instructions on stripping a wire can be found in steps 2 and 3 of Jayefuu's Instructable here: https://www.instructables.com/id/Strip-and-Tin-Wir...