So, we learn how to say no. But how do we learn when to say yes? Well, one way is to figure out roughly how much time it would take by comparing it to other projects of similar length. If you've ran a server before, you can roughly figure out how much effort adding another server to your mod list will be by comparing the amount of active users, the amount of other mods, and the amount of typical mod intervention. This entire thing ties into a lot of things- being able to say no, being able to properly manage time, being able to learn how to scope projects, etc. Yet it is something so highly important but often overlooked.
Our time is the only thing that everybody has but everybody can't afford to run out of, so why do we not value it more? I often try to find new ways to manage my time even better, but most guides I see all say cut out social media and TV and such, to the point of cutting off wi-fi. While I could go on another rant that this sort of strict regimen every day is the definition of workaholicism and not really living, what I will say is that we can all find ways to make life less stressful for ourselves by alleviating some things in our schedule.
So, for now, decline a task and take a Netflix break.