All writers are also readers. Your job as a writer is to put yourself in the position of a reader coming to your book for the first time. It's not easy, but once you've mastered the trick it will pay dividends. Then you'll know how to edit your writing. Read 'How To' books if you must, but develop your own way of working.
Every writer works differently.
Some write every day from 6 a.m. to noon, others work best in the small hours. Some aim to write a thousand words a day, others are pleased if they manage a hundred. Some polish as they go along and can't start the next bit till they' re satisfied, others write the whole thing without stopping then go back and tinker. Find the way that works for you. I was interested in.