The transition from online to live is tough mostly because you lose the software safety net. Online, the computer calculates the pot, stops illegal bets, and manages the action. Live, you have to do all of that yourself while feeling like 8 strangers are staring at your every move.
Like Rodrigo and Poker_Mike said, playing tight early helps. But to actually kill the physical nerves, just build these mechanical habits:
1. Vocalize your actions: Adrenaline makes your hands shake, whether you have the nuts or a huge bluff. Don't fight it. Just announce your action out loud first (e.g., "Raise, 45"). Verbal declarations are binding. Once you say it, you can take all the time you need to clumsily count your chips without worrying about string-betting. Let your voice do the work.
2. The 3-second rule: Online, you have a visual timebank. Live, rookies feel imaginary social pressure to act instantly. Force yourself to count to 3 in your head before every single decision. It stops the rushed anxiety loop dead in its tracks.
3. Nobody is analyzing you: You feel like the whole table is judging your mechanics. Reality check: 90% of low-stakes live players are just thinking about their own cards or checking their phones. If you act out of turn or mess up a bet size, the dealer simply corrects you and the game moves on. Literally nobody cares.
Just breathe, use your voice to declare bets, take your time. You'll settle in fast. Welcome to the live grind