The good news is that once your manuscript has reached this point you are getting very close to the end. However, there is a very important step to undertake: the copyedit. This means going over of your text with a fine-toothed comb to correct ‘typos’ – like spelling mistakes and grammatical errors – and to ensure consistency of presentation.
Without exception I recommend that this task is given to a professional editor who has the skills, knowledge and experience, including an incredible eye for detail, needed for the job. Don’t give it to a well-meaning friend (unless they have that qualification) and never, ever try to copyedit your own work.