What is a poor practice that can lead to increased stress when diving?

Using equipment you are not familiar with can significantly increase stress when diving. Familiarity with one's gear is crucial for safety and comfort underwater. When a diver uses unfamiliar equipment, anxiety can arise from the uncertainty of how the gear functions or how to respond in emergencies. This unfamiliarity can lead to mistakes that compromise safety, reduce the diver's awareness, and further heighten the stress levels during the dive. On the other hand, preparing for a dive ahead of time, engaging in regular practice dives, and participating in a dive group are all practices that can enhance confidence and minimize stress by ensuring that divers are well-prepared and supported during their underwater experiences.