If you want to write well, write badly.
Apparently, 41% of us are afraid of public speaking.
Compared to 19% of us who are scared of death?
In my experience, a significant percentage of people are terrified of writing.
Fear not, writing is a low-risk activity (even with a sharp pen on public transport over hilly terrain).
Unless, of course, you're driving the bus?
Just write it.
Your business content, bio, email, poem, outline.
Then edit and pick at it.
Don't get it right, get it written.