Some time ago i published a video on how to use a chain tool to remove and replace a bicycle chain. This video is more in depth where it shows you more details on the job. Chain length can be an issue, too long or too short and other such little details are included in this epic production... Ok, not really epic, but I am trying to get better at this. Making movies is not that easy. So enjoy and I hope this will help you out. You can check out the first video that showed a close up on using the chain tool here.
Til then next time, ride safe and Godspeed.
Gerry