Lift and remove the Lightning connector and headphone jack cable out of the iPhone.

Use a plastic tool to scour any bits of adhesive residue from the rear case behind the cable.

Compare your replacement part to the original and note any differences. You may find a rubber gasket adhered to the old headphone jack, which should be transferred to the new part if needed.

Test fit your replacement part, and then peel off any protective plastic films or liners before installing.