Can you practice writing small letters with regular script and pen-controlled copybook?

Yes, you can. Calligraphy pays attention to methods, but lower case fonts rely more on the overall shape and layout, which requires higher overall pen control ability, but the strokes and strokes of characters are not as strict as lower case fonts. It is suggested to practice Chinese characters first, and then practice Chinese characters when you have a little pen control ability. Practicing lowercase letters from the beginning is easy to cause hand trembling because of weak pen control ability and insufficient strength.