Excellent — what could be wrong with it?! I just want to give a heads-up: in all soldering tutorials on YouTube you’ll see different wire colors, and the one you buy won’t match any of them, nor will it match the colors in your current headphones. That’s why I strongly recommend taking photos of how everything was connected before you start. It will make things much easier later. And yes, you’ll need not only a soldering iron but also a tester. I emphasize this: the wire colors in your old cable, in the new cable, and in the tutorials will all be different.