Sure, you can buy a book that will guide you through the process of achieving career clarity and getting your dream job - I will happily recommend a few great resources that I've used myself in the past. For many people, a book will be just fine, and I think that's great!
The difference you get with a career coach is the presence of a living, breathing human being who is listening to you and responding directly to your needs. Someone who is able to help you see things from a new perspective, ask critical questions to get you to the next level, and support you in taking steps that you're struggling to take on your own.
As a career coach, my goal is to help my clients paint a vision of their future that makes them come alive, and guide them in creating an action plan to make that vision a reality. That's what I want for you.