i just tried to repair a pair of somewhat crappy boots.
the zipper down the side was broken, so I thought:
"Hey! I'll just rip it out and put in a new one!"
that really didn't go so well.
So, they are headed to the trash bin.
Lesson learned from this?
Research before you assume that because you can sew you can repair anything.
and don't waste 2 hours and a zipper trying to repair a 20$ pair of payless boots.