Amie B. answered 04/06/19
Detailed editor and proofreader with 20+ years experience
Take a deep breath.
Read through and edit for grammar and mechanics.
Put it back in the freezer and think about what you've read.
Take it out again (with a pint of ice cream).
Start rewriting. But in small pieces. (See "1 inch picture frame," Bird By Bird.)
Good luck!