Final answer:
The character who helps Pip with the business transaction for Herbert in chapter 49 of Great Expectations is Pip himself, emphasizing the first-person narration pivotal to the novel's exploration of Pip's development and experiences.
Step-by-step explanation:
In chapter 49 of Great Expectations, Pip is assisted by none other than the character of Pip himself, as the first-person narrator and protagonist. Because this chapter deals intimately with Pip's personal endeavors, particularly the business transaction for Herbert, it falls in line with Pip's overall growth and narrative journey within the novel. This form of narration is critical in allowing readers to gain insight into Pip's internal thoughts and feelings, and how these thoughts and feelings evolve over time, as he matures from a young boy into an adult.