First, pull out your laces so they wont get in the way, then cut along the sides where the inside of the shoe is glued down, then cut off whatever rubber is hanging off, or ripped on the sole

Next, cut out some plastic to fit over the holes in the sole, and glue it down. I used hot glue, but I'd suggest gorilla glue or super glue. I also used the plastic from an old floppy disc because it was light and easy to glue down

Now take your stuffing in chunks and glue them to one square on the inside. Repeat this until you're satisfied.

I used a bobby pin to push the fill down so I wouldn't burn my fingers

And you're done! I didn't seal the inside of my shoe down in case I needed to put in more filling, but you can, and then just cut it open again if you need more. I'm pretty sure this isn't going to be a permanent solution, but it's fast and easy, so I don't mind it