Did the author have any personal doubts about undertaking the task of writing about Sai Baba, and how were they resolved?

Yes, Chapter 2 reveals that the author experienced significant self-doubt. After the thought of compiling Baba's stories arose, the author confided in Madhavrao (Shama) but harbored doubts about their ability to complete the task. The author mentions being over sixty years old, feeling their intellect was not sharp, and worrying that weakness might cause the effort to fail, resulting in nothing but empty talk. However, this doubt was resolved by the thought that even the 'talk' should be for Sai’s love to achieve a spiritual goal. The author concluded that any other talk would be useless, and therefore this effort was worthwhile.