What actions does the narrator take to prepare for the crime and the cover up?

The narrator meticulously plans the crime by selecting the perfect victim and devising a method to commit the act without leaving evidence. They acquire necessary tools and create an alibi to divert suspicion away from themselves. After the crime, the narrator takes deliberate steps to conceal the evidence, ensuring that any traces of their involvement are eliminated, further reinforcing their alibi. This careful preparation highlights their calculated mindset and determination to evade detection.