Also, know what it takes to meet them.
Attention to detail is monumental when working through a real estate transaction. If the closing date cannot be met, do not assume the parties will agree to an extension. Both clients are put in jeopardy when the agents involved are not properly facilitating their part of the transaction. Being complacent can cost you the deal. It can also cause the parties to look carefully at whether or not you honored your fiduciary duty to discharge reasonable care and diligence.
Communication is paramount. Keep the other REALTOR® informed of issues that affect the closing as soon as you know them and document that communication.