Chapters Shitty First Drafts and Perfectionismare particularly helpful (and quick!) (Links for viewing online are available to University of Michigan Law Students only).
By Anne Lamott, Bird by Bird: Some Instructions on Writing and Life, pp. 28-32 (1995)
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[Important note: Good Sentences does not endorse any of the opinions contained in the sentences in the collection. The only thing we endorse is the elegantly effective way these sentences were constructed.]