If you are trying to write (or draw, sculpt, decorate, you get the gist) perfectly, your attention is on all the ways your work falls short of perfection. You become critical of each word choice, each transition, each sentence. Often you hear the voices of critics and naysayers: all those who told you that you could not write, every teacher and writing group member who scoffed at something you wrote. This inhibits creative freedom.

Get past it: Your attention is not on the magical process of creativity but on some external ideal that you cannot possibly meet, or some admired and feared authority whom you cannot possibly please. Instead, free yourself from those voices and write despite them. You can always go back later and refine, but releasing your thoughts from your mind is the first step to overcoming writer's block.