What is there to be excited about? When the work isn’t finished, why are you so attentive to the end? Be careful not to lose focus on the present because of a competing vision. Your brain is trying to balance two views of the same situation. First is the picture of what you need to do, which is easily the most important. Second is the view of the outcome. You should always pay more attention to what needs to be done in light of the second. If you become too concerned with the final product at the beginning, you won’t begin at all!
This, for many, is the challenge of being a writer. So many people would love to write a book because the final product seems so big and exciting. What holds them back? They’re only excited for the final product, not for the painful experience of writing. Get excited for the work to come, if you’re excited for anything. The job is not finished.