Taking apart is easy if you don’t have the tool, grind the worked end of the link off. You can put em together without the tool as well as long as your careful. Get a repair link, put it together on a anvil, then take a hammer and peen the end of connecting link. I fixed my 404 chains on the processor like this before because none of the saw shops had a tool that could handle 404 chain. I’d check northern tool or baileys and just get the right tool, it will be able to break the chain and reassemble.