Of course you can learn calligraphy (brush) by yourself. Just slower. If you can have a teacher to guide you, you can get twice the result with half the effort. Each person's handwriting can be said to be that person's second face. The handwriting is like the person. Writing is very important. It is best to practice calligraphy more if possible. If you are in Tianjin, you can go to the Youth Palace. The Youth Palace has training classes for hard-pen calligraphy and brush calligraphy, both for children and adults, so why not check it out! There are also national-level examinations and some competitions and exhibition activities there, which is a relatively large platform for learning and growth.