First, copy the written calligraphy work to the stone surface to be carved (if you are sure, you can write it directly). The copy must be meticulous, not even a trace of white spots can be missed. You can delete the complex and simplify. Then there is hard work. It is better to carve bit by bit by hand. If you use a machine, unless you have special tools and skills, it will be difficult to compare with the precision of pure handwork. The last step is to fill with blue or sand (that is, fill the good mural with azurite or cinnabar red). Even the cliff carvings do this. As long as the effort is real.