How to teach yourself hard pen calligraphy?

I will emphasize one point here, that is, a more abstract understanding. When you write a word, you can feel where the word is badly written and which stroke needs to be corrected. Find out and practice it again and again until you are satisfied. I really don't know how to write it. You can look at the copybook. Writing should have its own style, all of which are copying. I always feel that what I write is the same, with no special features, although it looks good. Although I didn't follow the copybook, I spent a lot of time and my interest was very important. Practice more, come on! You can find some poems to practice, practice whatever you like, as long as it is words, and it is not bad to learn other knowledge by the way.