There are times in your life when you may have to shoulder more responsibility than you care to. Sometimes you get stuck doing something that isn't part of your "job." Say your husband normally takes out the trash, but keeps forgetting, or just doesn't do it. You may find yourself lugging those smelly, gross trash cans down the driveway thinking, "this isn't my job." Or "really, you have one simple task to do, and you can't even do that."
In those times your spouse needs grace.
Maybe a co-worker who normally does a certain task stops doing that task, or they get busy doing something else and you are left to do that task, it's not fair is it? You know it's not your "job" to do, but it needs done. So you might as well do it, because who else in your office is going to step up?
Give your co-worker grace.
These times in your life that require more effort, more responsibility, more care often stink and suck the life out of us. Personally speaking there are seasons in my marriage that I feel like I do more "work" than Eric does, and I am sure there are seasons he feels like he is doing more "work" than me.
That's the beauty of living in grace. When you truly trust and rely on God to help you through, he does. Whether he provides you with extra physical strength, a calming attitude, or an understanding heart, his grace is sufficient for you, you just need to ask for it.
There will be times when you are plain taken advantage of because you are a hard worker, you do pitch in and get the job done, people count on you to do it all because you have come through in the past. Those times give the other person grace, and give yourself grace. We often feel taken advantage of because we will go above and beyond, and yet the person on the other end does not reciprocate. Grace...it's terribly hard, and often isn't a quick fix, but ask for grace.
Whether you find yourself in the season of being a worker bee thinking "this isn't part of my job description" or you are in a season of heavily relying on others to help you out, remember to ask God for his unending, all filling grace, and then live in it.