The Narrator's Tone In 'The Tell-Tale Heart'

The narrator’s tone changes throughout the story, The Tell-Tale Heart. During the first section of the story the tone of the story the narrator appears nervous. Then as the narrator decides on his plan he becomes more confident. Then towards the end of the story the narrator becomes fully confident of the way he did the murder, then finally as the story is coming to an end the narrator becomes terrified.
First, the text says on page 537, “...very, very dreadfully nervous I had been” and “but once conceived, it haunted me day and night.” First it says that he is nervous, then it goes to explain why he is nervous. The eye was starting to haunt everyday and it was making him nervous.
Next, the text says “You should have seen how wisely I proceeded-with what foresight-with what dissimulation I went to work.” In the beginning the narrator was nervous, but as he made up his mind to get rid of the evil eye, his confidence increased. So he made a plan on how he was going to kill the man and thought that he ad simply been too smart to be mad, that his plan was too good for a madman, he became arrogant.

But then,”I felt that I must scream or die!” and, “Villains I shrieked, dissemble no more! I admit the deed....It is the beating of his hideous heart.” in the last lines he starts to hear something, a beating that became louder, and louder, and louder, and louder! Then he realized the sound was not in his mind and he became terrified. For he thought the sound was the beating of the dead man’s heart. The sound terrified him so much that he admitted to the murder, then showed the officers where the body had been hidden, because he thought that they already knew, that they were mocking