If you keep this in mind, you won't start feeling like you can just climb down out of that tree and start scratching your pal behind the ears. Ask your client's attorney about the opposing counsel's style. He can probably give you a pretty good read on the guy. What you wear and how you walk is important. Wear nice clothes, shoes shined, hair in place, and don't try to impress anyone with your jewelry.
Jurors are just everyday people and they sometimes resent having success thrown in their face.
You may alienate them before you even start. So dress nice, but be conservative. Dress like you're going to church. Walk like you're in control, even if your knees are shaking. Approach the stand and stand up straight.