Choosing a Book Title

Picking a title for your book is difficult for some and extremely easy for others.  I pretty much land on the difficult side.  How do you name your "baby?"  Just like new parents, one writer might latch on to the PERFECT title right away, while another settles for a WORKING title.   It's "good enough for now."  Hopefully, when the time comes, you'll just know.  Choosing a title is one of those decisions that can land on either end of a continuum or somewhere in between.

So just how much energy should go into this decision anyway?