To calm your nerves before a big blackjack game, focus on preparing both mentally and physically. Engaging in deep breathing exercises or meditation helps alleviate anxiety, while visualizing a positive outcome can boost your confidence. It’s also beneficial to familiarize yourself with the game rules and strategies to reduce uncertainty. Additionally, ensuring you're well-rested and hydrated can enhance your overall state, while taking a moment to remind yourself that it's just a game can help keep things in perspective. Ultimately, a combination of relaxation techniques and proper preparation can create a more composed mindset.