Considering you have your hands around your clients' necks, the potential power is quite great. We don't recommend you acting on that though. You do have the power to make people feel good—hopefully that will be enough for you. In reality, though, a client can always easily switch to another provider. So customer service with a smile is a must. If you are not a People Person, find another gig; even if you are great on the table, if the customers start resenting paying you out of their hard earned savings, you are doomed.