Based on Chapter 1, what is the traditional reason for performing auspicious invocations at the beginning of a task?

Chapter 1 explains that the traditional etiquette of performing auspicious invocations, or Mangalacharan, at the start of any task serves a dual purpose. The primary reason is the removal of all obstacles to ensure a project's smooth and successful completion. The author specifically mentions bowing to Ganesha, the destroyer of obstacles, for this reason. The second purpose is to obtain the grace of the desired deity and thereby fulfill the intended goal. In this case, the goal is to write the life story of Sai, and the author seeks blessings from various deities to accomplish this sacred task for the benefit of all devotees.