There are better ways, but as a kid I used to use a hammer, a chunk of wood to support the chain, and a nail punch. That was 70 years ago. Wait for the chain breaking tool to arrive. And like others have stated, maybe you won't have to break the chain if you can free it from between the cog and frame. Wearing gloves helps when trying to pull it free. Just keep at it and don't give up. t/his is a great learning experience. Good luck