Well, it's that time of year when we start thinking resolutions! The key to keeping your resolutions is, of course, making them attainable ... by making them look attainable. Break that big task into smaller chunks. For example:
If you're a writer, and writing that whole book seems daunting, piece it off. Instead of "I will write a 100,000-word book and submit it to a publisher," you may want to try telling yourself "I will write two pages a day. By December 31, I will submit its first three chapters to a publisher." (And remember that any writing counts, even if it's a rough first draft. You can go back and edit what you wrote, but not if you have written nothing!)
Even if you've decided not to make a resolution, I hope you're looking forward to a bright, happy, and productive New Year. Cheers!