Calligraphy pens with curved tips are generally not suitable for beginners. Because it is difficult to grasp the strength and angle. It's wrong to write it out. It is best to use an ordinary pen. If the copybook you are practicing is obviously written with a calligraphy pen, you can try to imitate it as long as you like.
Calligraphy is very particular about using pens. Pay attention to combination and lifting in the process of pen lifting. Holding a pen is similar to an ordinary pen. Adjusting the angle can adjust the stroke thickness, but it does not depend on the stroke thickness. The nib is embodied in the rotation and lifting of the pen.