Two
Mark the place where you will break the lock.

*In this short article, the author adds an important instruction for the preparation work.

Three
When breaking in, it is of utmost importance to know where the wind and sounds come from. ...Be certain that you do not make noise while using special tools for breaking in.

*Though not directly a technical aspect of breaking a lock, it is nonetheless an important consideration. The locks where rather massive and crude, and quite breaking was unlikely. To remain undetected while bending or hitting the metal, the author instructs a careful consideration of the direction of the wind and sound.