Read your work aloud, if you can, if you aren't too embarrassed by the sound of your voice ringing out when you are alone in a room. Chances are that the sentence you can hardly pronounce without stumbling is a sentence that needs to be reworked to make it smoother and more fluent. A poet once told me that he was reading a draft of a new poem aloud to himself when a thief broke into his Manhattan loft. Instantly surmising that he had entered the dwelling of a madman, the thief turned and ran without taking anything, and without harming the poet. So it maybe that reading your work aloud will not only improve its quality but save your life in the process.