If you don’t have good interview skills, such as being able to sort through the minefield of a faked CV etc. There is one sure way to know if you have someone in front of you who is a genuine diesel mechanic with a love for the job. Just shake his hand. You are looking for the feel of an elephant hide. If you get the soft skin of a baby’s bottom, you can bet your bottom dollar the applicant’s last place of employment was behind a desk. Don’t employ him. This piece of wisdom stood my husand in good stead when one of their applicants was discovered to have stolen his dead brother’s CV. The guys got suspicious when this person proved to have no idea how to connect the positive and negative leads on a battery.