There's something only you can do, writer, and that is write the book. No one else can do that part for you.
But all the rest of it — figuring out the best way to shape all you have written, making every word of it shine, designing the cover and interior, and getting it bound and made? That can be the expertise of others. You don't have to do it all.
Focus on your part — the part only you can do. Let others do their part in support of you and what you've made. Together, you'll all be proud.