Wait, is it about them grasping the work itself or sharing the moment? Sometimes kids don't need the job description, they just need to see you DOING something real. That hands-on stuff makes it click way more than any talk. The install was the thing they could finally see and help with. That's HUGE. Their excitement proves the doing mattered more than the telling. You gave them a real piece of your world.
Remember how I tried to explain how a toilet tank works? My kid just stared until I took the lid off and let him fiddle with the float. Yeah, I'm way better at the messy doing part than the smart explaining part.
My youngest finally got how the washing machine fills when I let her drop the soap pod in and press the button. That one simple action made the whole chore make sense to her. The doing is always the real lesson.