It's never too early to start marketing your book.
Book marketing is a skill: it takes knowledge, effort, and persistence to really be successful.
Book marketing should be a planned process, an art if you will.
Marketing starts even before our books are published.
If writing and publishing a book is like giving birth to a child, then book marketing is like rearing it.
As much as we don't want to hear it, book marketing is a huge part of becoming a successful author.