The weight is borne on the strong foot. Push against the handles and shift your weight forward. Swing your body forward with weight on your hands, and bear a slight amount of weight on the weak foot. End with the strong foot ahead of the crutches. Keep crutches on the lower step.
Body weight is on the hands.
Raise the strong foot to the step above, trailing the weak leg. Straighten the strong leg and advance the crutches to the next step above. Place crutches on the lower step, and extend the weak leg forward. Body weight is on the hands. Bend the strong leg and slowly lower the body.