About 20 years ago I was in the midst of changing one of my babies' worst diapers on what was already a stressful day. While feeling put upon, disgusted, and resentful, I happened to glance up from the mess and looked straight into my baby son's eyes; he looked right back at me, and had the happiest little face, so content was he to be cared for and loved. And I had an epiphany: at that moment, could I have been doing anything more important than cleaning poop off his butt? No.
And thus I learned that doing God's work can be unpleasant, unskilled, unappreciated, humbling..... and liberating.