Yes, with the right resources, dedication, and practice, it is possible to learn Computer Science without any instructor or tutor. To do so successfully, you must have an organised learning plan and the willingness to commit yourself entirely to this pursuit.
The best way to begin learning Computer Science without a tutor is by doing research online. Numerous websites, such as Codecademy and Udemy, provide comprehensive courses in various programming languages.
Additionally, many community forums are available where experienced developers discuss tips and techniques for coding more efficiently. You may also find helpful guides explaining how different programming concepts work. Finally, once you've identified your desired language or speciality area of focus, dedicate yourself fully to mastering on it.