Attending calligraphy training class is the best way! Why do you have to explore again when you have experience? Isn't that a waste of time and your life?
Calligraphy classes are guided by professional teachers, who will correct the problems that cannot be found in time. It only takes about three years to learn calligraphy through training courses and reach the same level.
In addition, self-study depends on perseverance and persistence. If you can't guarantee the study time (insist on practicing calligraphy for at least one hour every day), or study regularly, if you want to succeed, it will be far away ... I wish you all the best!