DO THINGS BY THE BOOK
BETTER TO BE SAFE THAN SORRY
ERR ON THE SIDE OF CAUTION
BECOME SECOND NATURE TO YOU
FOLLOW THE CORRECT PROCEDURE
CUT CORNERS
To do things in a safe way to avoid risk.
To do things in a very safe way.
To improvise, to do sth without care so as to save time or money.
To become natural.
To do things in the correct way.
Don't try to make up your own rules.
