I believe in this industry, you should have faith in the people who appoint you for they are taking a chance on you also. But the fact that there are a lot of people who loves to take advantage on others, we need to be cautious and know how to protect ourselves from them. With that, I recommend reading this article : timedoctor.com/biz3.0/how-to-make-sure-you-always-get-paid/ . God bless!