What did you think you should have known before starting freelancing?

[Btaliat]

Most freelancers have started freelancing before they realized some tips. Some wished they have studied the tips first before they started. Some don't knkw how to relate with clients, especially with different characters, until they started freelancing. This has really affected them. Some don't even know much about how to price until they started. They don't know the technique to be used to get price sealed without them being affected. What are those things you wished you know before you started freelancing?