As professional freelancers, there are some mistakes that need to be avoided. Clients may not really see as anything if those mistakes are committed by tbr new freelancers. But they may feel somehow if they are committed by the professional. Among the mistakes include overconfidence. While it is good to have confidence, if it is getting out of hand, you will be losing more clients. Another one is underpricing to get more customers. This will make some clients to lose their trust i.n you.