One big lesson I've learned over the years with growing clients is to recognize the difference between Resistors (who never become clients) and those who have already bought into wanting to be better, growing business and rocking their branding. You want clients who want you, want your expertise, and are ready for a journey. On the flipside, trying to do client-prospecting to Resistors often involves you playing the role of trying to be the Convincer. You literally pull your hair out trying to explain why doing X,Y and Z will improve his/her business will result in more customers, more sales and more sales. Unfortunately, it's often all to no avail.