How to learn Ou Yangxun's calligraphy?

Ou Yangxun is clever and diligent. He has read several lines at the same time. When he was a teenager, he was proficient in Historical Records, Hanshu, Dongguan Han Ji, especially calligraphy, almost to the point of obsession. It is said that Ou Yangxun once rode out and happened to see a stone tablet written by Suo Jing, a famous calligrapher in Jin Dynasty. He rode on a horse and watched it carefully for a while before leaving, but just a few steps later, he couldn't help but return to dismount and watch. He boasted many times that he didn't want to leave, so he simply laid a blanket and sat down to ponder over it. Finally, he sat by the monument for three days before leaving.