Isn't it also odd that there are only two times a year when we're encouraged to develop new habits, get rid of harmful, unnecessary things and generally get our acts together? The rest of the year it's okay to be a disgusting, lazy slob and an utter train wreck. As long as we declare our intent to get/be better twice a year, we're doing fine, just like everybody else. It seems like there are certain things in life when all you need to know is that NOW! is what time it is.
For writers, people who spend inordinate amounts of time wandering around our own heads, our minds tend to be where a lot of our clutter ends up. Well, this is it, writers. NOW! is the time to clean it up, clear some space and get organized!
First things first, there are two kinds of writerly clutter in your mental attic:
Useless clutter is doubt, "what if?" scenarios, regret, fear or any other self-imposed anxiety that gets in the way and keeps us from doing what we're supposed to do, which is writing. Getting rid of the useless clutter is much more difficult as there is no one, simple method for eliminating it. You might need to talk to somebody. You might need to spend hours in quiet contemplation. You might need the love of a good man, woman, cat, goldfish, rugby team, etc. You might need a figurative or literal boot in your ass. You might need coffee. You might need all those things plus some other stuff. I wish I had that answer for you, because if I did, I'd be rich and I'd buy Peevish Penman and turn it into a fan site celebrating me and my genius creative output. As it is, I'm just like you in that I get cluttered from time to time and need help in figuring out how to get un-that way.
The point is, there is no right or wrong way to get rid of the useless clutter. When it comes to freeing yourself to realize the full scope of your creativity, the end always justifies the means. Find a way to get rid of that which keeps you from doing what you do and don't wait for the hands on a clock or a page on the calendar to tell you it's time to do so.