Friend, maybe you don't know much about calligraphy. According to my experience, the only shortcut to hard pen calligraphy is to practice brush calligraphy. I suggest practicing regular script first, and then practicing other fonts slowly. When you practice the font, you will know the fun of writing slowly. Calligraphy is not as simple as you think.
If you just want to write a round font by yourself. I suggest you practice POP hand-drawn fonts. If there is anything you don't understand, please say it.