Remember to bring your instrument and all related equipment to rehearsal. This includes spare parts for your instrument (strings, rock stops, reeds, double bass stool, cork grease, valve oil etc.), a 2B pencil, and eraser.
Be courteous and professional in rehearsals – listen to the conductor and refrain from talking to others during this valuable rehearsal time. Listen to your conductors even when they are talking to another section, as it will save them having to repeat instructions.