You are personally responsible for your safety. The Range officer or instructor has enough to administer without constantly reminding participants of basic safety procedures.
Eye protection including side protection must be worn at all times.
Ear protection must be worn at all times
Leave your guns in their gun bags or boxes. Put on your holster and mag pouches.
If you show up to the range unarmed. Leave your gun in the bag while a range officer takes you over to a safe direction to help you get your gun in a holster.
If your carry gun is on you and loaded, and that is the gun you choose to shoot. Then leave it in your holster. You can change out your magazine with a magazine with ball ammo without taking it out of the holster. If this is new to you get a range officer to assist you.