I don't use the le tool. waist of money...

I draw a centerline on the le and then slowley with thin amounts razor plane off to get it close, then I gently sand with a small block with 50 grit glued to the block. Then I sand with 100 grit with a 3 foot bar. Gets a very straight leading edge. Finish up as minnflier says with some fine, 220 ish paper like yer polishing. When in the final stages u can hit it with some 400-600 to get it really smooth...

Unwanted scratches can be lifted with a little water. It will swell the scratch. Let air dry then sand it. Gone...