Determine the third person narrative distance that will work best with the story. For instance, a third person limited narrator, which limits the point of view specifically to the protagonist, will work easiest when switching points of view from first to third. If the story requires points of view that will go beyond the main narrator, then choose a third person omniscient narrator.
Determine ways to maintain the main character’s voice. For instance, in first person point of view, the character’s voice might be sarcastic and biting. In third person, this can be maintained by using a sarcastic tone or style that matches the main character’s perspective and attitude.
Pay close attention to the narrative distance and maintain it. If the narration is written from close point of view, then make certain that the novel is written consistently from that perspective. This means that the reader sees only what the narrator sees, feels, hears or knows. For example, if the main character is having a conversation with someone who is agitated, then the narration should only describe observable behavior, such as facial expressions or body language. The main character can draw conclusions from observations, but use words such as "seem" or "probably" to suggest that this is the narrator’s observations. In a third person omniscient, a certain level of distance between the narration and the characters should be maintained. This means that the narrator observes everything that is happening in the story, including the characters' internal thoughts, and knows things that the main characters would not know, such as a city’s history.
Determine whether to use a subjective or objective point of view and maintain it. Subjective point of view closely matches first person point of view. Subjective can include the character’s thoughts and reactions. For instance, in the conversation in which one character is growing agitated, the main character can wonder internally what is wrong with this character and why. Avoid using terms such as “he thought” or “she wondered.” The narration will already express the main character’s thoughts and ideas. Go directly to the observation. An objective point of view is not unlike a journalistic piece, revealing only what is externally observable.