They are worried lest their clothes are not all right for the occasion, lest their tie is of the wrong shade, their shoes of the correct style, and a thousand and one things that they seem to conjure up for the especial purpose of worrying over them.

Who has not seen the nervousness, the worried expression on the face, the real misery of such people, caused by trifles that are so insignificant as not to be worth one-tenth the bother wasted on them.
The learning of a few fundamental principles will help out wonderfully.

The chief end of "good manners" is to oil the wheels of social converse.

Hence, the first and most important principle to learn is a due and proper consideration for the rights, opinions, and comfort of others.

In other words, don't think of yourself so much as of the other fellow.