Remember every examiners job out there is to teach the student. I've seen students do well on the oral and become almost pompous about it because the examiner can't stump them. Thats fine but make sure there is that line of authority. Some examiners are high on their horse and don't like that authority compromised. Be modest in the oral exam and make darn sure your flying is stone cold better than PTS. If your instructor is good, they will know when your ready. I knew a guy that failed 8 checkrides and now works a corporate flying job in beech 19's. You'll get hired somewhere..