Kelly Kettles are lifted clear of their fire bases and flames by holding the handle (with both hands) at an angle of 90 degrees to the body of the kettle. 
Lift the kettle straight up keeping the handle parallel to the ground.  The weight of the kettle will ensure that the kettle remains upright and that no water will be spilled. 
Once the kettle is clear of the base & flames, you can hold the handle in one hand directly over the chimney of the kettle. 
To pour the water, hold the handle in one hand and gently lift on the cork chain to pour. 

Note: Never lift your hands directly over the chimney of the kettle when the kettle is lit as it can result in a burn.