Good luck. Make sure that the DPE takes checks. Many prefer cash.
Use good judgment. If you are screwing up a landing, go around. A go-around is okay. A bad landing will probably be a fail. Just make sure you nail the followup landing.
Don't forget your clearing turns prior to maneuvers. You can do the best steep turn in the history of aviation but if you didn't clear first, you'll likely fail.
Don't BS during the oral. If he asks you something that you don't know, just say so. As long as you answer the great majority of the questions correctly, one or two "I don't knows" will not doom you. But be prepared to tell him where you think the information can be found, i.e. FARs, AIM, PHAK, etc.
Be sure that you know the reasons for various maneuvers. He might ask why knowing how to recover from power-off stalls or power-on stalls is important or when they might accidentally be encountered.
Know the current special emphasis topics. Know them well. TFRs, interception procedures, Special Use Airspace, LAHSO, runway incursion, etc.
Know Crew Resource Management, especially how it applies to single pilot. Know your resources.
When it comes time to go under the hood and back out of it, be sure to exercise good positive exchange of control technique.
I'm sure your CFI has adequately prepped you but these are some things that trip up some pilots and you are a pilot. Now go prove it.