Shaving oil or gel work better with goatee styling than shaving cream because they are see-through, making it easier to prevent mistakes. The outer edges of a goatee should not extend past the smile lines of the cheeks. Using a nose hair trimmer allows more delicate shaping around the edges.
Using a trimmer to create an outline of the goatee provides a useful guideline to follow while shaving. It is important to shave away from the edges of the goatee, rather than shaving inwards, to avoid cutting too much hair. Stop occasionally during a shave to check for symmetry, looking from close up and far away.