To become a scribe requires rigorous study and training-and great skill. Certainly, a person who has not carefully studied the laws pertaining to composing a Torah scroll cannot be a scribe. Above all, however, the scribe must be a G‑d-fearing and pious person, dedicated to the sanctity of the Torah scroll.
The scribe may not rely on his memory, but must copy the letters, word by word, from a kosher Torah scroll or a copy of a certified Kosher scroll. A right-handed scribe writes only with his right hand; a left-handed scribe, only with his left hand.
The Torah scroll, and especially the Names of G‑d contained therein, must be written with utmost purity and devotion. It is therefore customary that the scribe immerse himself in a Mikvah (ritual pool) before beginning his work. He also recites a blessing at the outset of his work and before each time he writes the Name of G‑d.