The narrator makes this comparison in Chapter III of Three Men in a Boat. Harris seems to go overboard (so to speak) on wanting to list absolutely everything that must be taken along on the upcoming boat trip. This approach reminds the narrator of his own Uncle Podger:
That’s Harris all over – so ready to take the burden of everything himself, and put it on the backs of other people.
The narrator then relates a lengthy story about his Uncle Podger, who takes forever and goes through many tools and strategies to simply hang a picture on the wall. He makes the simplest acts more complex than they need to be. He’s stubborn enough to think that he knows quite well how to do many things. The reality is that he doesn’t know how to do these things at all. He does such a terrible job that eventually someone else must intervene in order for the task to get finished.
Later in Chapter XI, when Harris tries to make scrambled eggs, the outcome mirrors Uncle Podger’s difficulties in hanging the picture. Whatever can go wrong, does. And no one ends up with scrambled eggs for breakfast.