Scrub your first chapter

All writers feel concern, and a certain amount of stress, over the time and effort required to revise an entire book. Here's a process to consider.

Before you begin your second draft with all that this involves: evaluation and revision of revision of flow, dialogue, characterization, etc., review your first chapter (only) to identify writing mechanic errors. For sure, you'll find a bunch of them. (Remember, your first draft was just that, a first draft. You "vomited it out," knowing you'd clean it up afterwards.)

When you examine and revise errors out of your first chapter, your "inner editor" pays attention to these same issues as you progress through your entire document. You'll be more alert to repetition of certain words that really truly need to be revised. It's important to revise weak words like "was" and "get," and verbs that end with "ing."
Then, as you work your way through the 2nd draft, even though you are focused on context, not line editing, you'll begin to spot and revise the weakies. This helps you launch a new writing habit: utilizing strong verbs.

BTW: Check out my $7, 7-page tutorial, "35 Red-Flag Words that can Block Your Publishing Future." Locating and removing these rascals is reasonably easy using a Search-Mark-Replace program that's included in the tutorial. Available at MolliMart.