Never let 'em see you sweat. Guests feel guilty if they think you've worked too hard to make dinner for them - which of course you have!
The concept is basically; that the pieces we know and love are made up of scales, arpeggios, and the like.
I was sent to a nice Church of England girls' school and at that time, after university, a woman was expected to become a teacher, a nurse or a missionary - prior to marriage.