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Note how the old zipper is positioned before you remove it.
Before you remove the old zipper, look at how it is sewn into the item. It is important to sew your new zipper in the same way. For example, is the zipper material visible or hidden? Does the zipper material peak out from behind the raw edges of the item fabric a certain amount? If so, how much? Take note of anything you notice and take measurements as well. Record what you find to help you as you sew the new zipper into place.