When I was young my dad use to make lead sinkers in the inside fire. Us kids use to love crowding around watching it melt and the sinkers get made. A few years later he moved the production line outside and used a gas cooker and maybe gloves and overalls.
If I ever made it I would wear full protection probably including a gas mask, or atleast a full face protector. But I am not really motivated in that direction. Would prefer to spend the time designing and modifying and building different rigs.