Replacing a jacket zipper for the first time. The teeth of the zipper were so worn at one end they couldn't bite, and the coat zipper would keep opening from the bottom.
Did one side, now doing the other. The other side is a bit tougher cause there's more layers. The stitching it strong but isn't super clean cause I have to do it by hand(too many layers for the sewing machine).
I learned a few things while trying to do this fix.
For instance, there are many ways that zippers fail. It's not always necessary to replace the whole thing. Sometimes a new zipper slider or bottom stop is enough to fix a coat opening from the bottom.
It's possible to buy parts separately or to get a kit.
I had to replace the whole thing because the teeth were too badly worn.
Hardest bit was getting the old stitches out to get the zipper off (was very well put together).