Why practice writing?  Remember the joke:  A tourist asks a New York native:  "How do you get to Carnegie Hall?  The answer: ... Practice."  To play the piano, we practice.  The baseball pitcher practices.  What makes us think we can write without practice. 

Here is the start of 10 Steps to Practice Writing from "Rules of the Road" for Soup Kitchen Writing:

Rule One:  Let the pen do the talking!