There are 2 ways to sharpen a pencil in the trade.
1. A Stanley knife. Take your pencil and a sharp utility knife, clockwise push the blade from 1cm from the pencil tip up into the lead. continue clockwise until pencil is pointed.
2. A Block plane. rest the pencil tip about 25 degrees and move the pencil backwards away from but against the sharp blade, continue clockwise until pencil is sharp.
You maybe thinking why dont i just use a pencil sharpener, and the answer is , your always guaranteed to loose the little blighter in your toolbox.