Attitude can do a lot for a freelancer. As a group, the "culture" at an agency can make or break big contracts. Businesses love to see a creative agency with a solid grasp on who they are. For freelance writers and brand consultants, the same applies. But over selling yourself can ruin a relationship and any potential clients you could obtain through that network. So how, as a freelancer, do you appear competent without coming off as overly confident?