Again, be systematic like eating corn on the cob. Work around the ankle until you come full circle. Don't worry about little minor cuts, they just happen sometimes. The water makes them bleed a bit more. Now for the section between the ankle and the knee.
Light pressure is all that is required.
The back stroke clears the razor for the next cut stroke. Work around the leg til you come full circle. Reduce pressure as you cross high-curvature areas such as the apex of the shin. As you come to the knee area, get more careful and clear the razor more often. The rough skin on the knee can be troublesome.