καλλιγράφος
From LSJ
ἐν πίθῳ τὴν κεραμείαν μανθάνειν → in breaking many pots, the potter learns his craft | of those who undertake the most difficult tasks without learning the elements of the art | don't run before you can walk
English (LSJ)
(parox.),
A penman, copyist, Edict.Diocl.inIG5(1).1406 (Asine), Hdn.post Moer. p.477 P., An. Ox.2.397, Pall.in Hp.2.102 D.