With a degree and reading books like Block and especially Schein you can build a strong foundation for consulting. We all have a good start as many have consulted family, friends, and on the job unprofessionally, but you still have other competencies to explore.
This book by Schein goes a little more into the models than Blocks. It gives steps that are similar, but of course you build your own way of consulting or even for coaching.
Schein steps (compare to my review on Blocks)written to develop my own coaching practice. Later, to become effective as needed in my pursue as an I/O psychologist. The idea is to blend in your professional area of expertise the right way to consulting.
process consultation
• To engage in an initial contact and entry (the intensity of pleasantness and unpleasantness aroused by their thoughts in the roles and styles of management).
• Formulating a contract and establishing a relationship that is based on helping as a professional.
• Identify problems through diagnostic analysis (helping the client to own the problem).
• Setting goals and planned actions at each evaluation.
• Action (intervention); is required upon the affects of feedback (the outcome will show impact in any system that will set the right principles as seen in the wholeness of the organization).
• To complete the contract this may require continuity, support, or termination of the project.
This is my favorite author, but still yet another good book to consider along with this understanding of consultation would be "The Change Handbook" by Peggy Holman, Tom Devne, and Steven Cady.
See my review on this book and it has 700 pages of techniques and theorectical information. As does Scheins because one outstanding emphasis is consultants have a lot of stories from their learning experiences.