Wash and dry your face and goatee
Comb the goatee hair downward
Decide the shape and length you want
Use a trimmer with a guard to reduce the length evenly
Trim slowly and check both sides for symmetry
Define the cheek lines and shave stray hairs above them
Define the neckline by shaving below the jawline
Trim the mustache so it does not cover the upper lip
Use scissors or a precision trimmer for small uneven spots
Clean up the edges with a razor if needed
Rinse your face and apply aftershave or moisturizer