Be prepared for a much different pace and a much different experience
Online is like gaming, naturally
Live poker is like being at a party, more social
The game is easier than online yes, but for many the slower pace can lead to making silly mistakes due to boredom.
To avoid that trap, enjoy the social experience, the environment, the fun of building up towers (like playing leggo), peeling the cards, all of it. By staying engaged in everything about the live experience you will get pleasure constantly, not just when you pick up a big hand.
You will want to practice staying calm under pressure and being comfortable with people observing you/staring at you. And to learnt o be comfortable watching others as well.
It's not for everyone, but I certainly find it a treat.
Wishing you best of luck on your first experience, get stackin!
(this video is for tournaments, but a lot of the tips will work for cash games)
(and this one is for cash, combine it with the other vid and you'll do great!)