First time casino questions

[CyberKnobby]

Hi everyone! I've been playing no-limit home games for about 4 months now and have gotten pretty good at the game. I try and play about 2-3 hours a day(in person, usually 6 handed) and am through harrington, theory of poker, and most of supersystem. I am to the point where my friends and thier friends are no longer challenging me, so I've decided to take my game to the 2-4 limit games at the casino near my house. The problem is that I'm incredibly nervous about the setting. Another thing is that I have not played much limit holdem, but it's all the local casinos offer(unless playing high stakes). I'm wondering what some of you more seasoned folks have to say about switching from quiet home games, playing against mostly familiar people, to a loud and colorful casino game. Any sugguestions for the switch, any casino nuances I should be made aware of?

Thanks for any advice!