Let's talk about the skills, experience and experience of sweeping the building (strange visit)

Politeness is the most important thing. Show your manners and qualities from the beginning of knocking at the door! This is the best self-confidence.

Be brave when you are cold, and give up wisely, especially when people are obviously inconvenient or the other party has clearly expressed their dislike. Enough is enough, and it will not adversely affect your next visit!