Focus on writing the story and don't worry about whether or not everything is right. Stopping to review your work and editing prematurely can deter you from what your primary focus should be: writing. Ever wonder how writers finish 300-page manuscripts in thirty days or less? Their initial focus is on getting the story out and increasing the page/word count--not grammar or how things sound. Edit only after you have finished writing the first draft.
Several people put writing off because they do not think they have the time or don’t know where to start, but a person must write until writing becomes a habit. If writing a book is something you desire, you must prioritize what is important to you and take the time to write.An aspiring writer can easily allow excuses, doubts, and fears to hold him back. Years will have passed and he will look back with regret that he had never accomplished their dream.
"Each day that you do nothing at all, you are one day further from where you want to be." (--Unknown)