How to Trim Leg Hair So it Looks Natural?

Yes you can, simply by using a guard on your clipper. I would use a #3 clip to start and if length is still to long go down to a #2 with the lever open(lever pulled down for longer length) and can simply close the lever to get a #2 shorter.

I recommend you brush your hair down with the grain (all hair flows 1 way evenly in natural direction).