The present invention relates generally to a trimming guide to enable a person with or without particular skill, or a robot, or a computer, or a numerical device to cut a predetermined design, style or shape. More particularly, the invention relates to a trimming guide that would enable a person by him or herself, with or without training or particular skill, or through the use of a robot or a computer or a numerical device to trim his or her own hair, or another person's hair to a quality, finished state which is a predetermined design, style or shape.