It may come as a surprise to you, but buying or selling a home is largely an act of faith. As a seller, you hire an agent whom you believe will do a good job for you. You turn your keys over to the person you have chosen to handle one of the largest financial transactions that most people ever make. You believe, or should believe, that they will handle this transaction in your best interest and make you the most money possible. It's interesting to me that many sellers believe that it doesn't make a difference which Realtor they hire, that the result will be the same. But that could be a whole article by itself.
Let's fast forward to negotiating an offer and opening escrow. Let's assume that you have multiple offers and are satisfied that your agent has represented you well--an act of faith again. You should have confidence not only in your agent, but in the agent's staff, and in the affiliated services they use such as escrow and title.