How do you spot a nightmare client before signing the contract?

[Btaliat]

You don't just accept clients without asking or even knowing more about the clients. If freelancers don't deal with them from the beginning, they may have problems dealing with them later. That's the main reason why it is necessary for the freelancers to iron it out. You may just tell them they they need to sing the contract before they begin working with you. Doing that will make it work easier for you as the freelancers.