Beginner friendly: Moderate

Starting a specialized online tutoring service for professional certification prep can be moderately easy for beginners. While it may require some initial effort to set up the tutoring materials and establish credibility, there is a demand for such services. Online platforms like Reddit and YouTube offer opportunities to promote tutoring services and reach potential clients. The key to success lies in creating high-quality study materials and effectively marketing the service. I'd rate it a 2 because with dedication and time investment, most people can start earning profits within 2-3 months.