Here is an detailed tutorial on how to replace a zipper.
How to Fix Your Jacket Zipper - Rugged Thread
Replace a jacket zipper (without unraveling) - iFixit Repair Guide
How to Fix a Zipper
How to Replace a Zipper in a Jacket
NO TOOLS REQUIRED – Our zipper replacement kit comes with everything you need to replace your zipper without any additional tools or sewing. FIX ALL
Zipper Repair Kit with Replacement Zippers [197pcs] Zipper Fix Kit & Replacement Zipper Slider Set with Pliers - Ideal for Fixing Luggage, Coats
How to replace a zipper
Schöffel Easy Jacket Zipper Replacement - iFixit Repair Guide
Replace a jacket zipper (without unraveling) - iFixit Repair Guide
Replace a jacket zipper (without unraveling) - iFixit Repair Guide
How to Replace a Zipper on a Jacket • Heather Handmade
Replace a jacket zipper (without unraveling) - iFixit Repair Guide
Sewing Tutorial - How to Replace a Coat Zipper
How to Fix a Zipper