Eventually, you and your clients will release the project to a director, photographer, editor, illustrator, etc. At this point, you must say to that person: “Go make your art.” That’s what you’ve hired them to do. They’re an expert at the craft. You’ve selected them from thousands of other people. Now, let them make something wonderful.
If you don’t have the right person, stop right now and find someone else. The risk now isn’t that something will screw up. It’s that you don’t have the right fit for the role.