Half a job
DIY is often (but not always) the domain of the man of the house. Power tools and planks of wood, not clearing up after themselves once they’ve finished painting the wall; finishing half the job and leaving the other half for next year. Those kinds of things.
The doing of only half a DIY job is the eternal frustration of the female half of the partnership, as is what happened in this case. Over the moon with finally having a blind up at the window, his wife must have shaken her head in despair when she saw what hadn’t been done.