A method of using a grass trimming apparatus includes the steps of: providing a grass trimming apparatus, including a trimmer head assembly having a spinning support guide at a bottom portion thereof, and a cutting mechanism positioned above the spinning support guide; holding the grass trimming apparatus in an operable position; placing the spinning support guide on a trimmable surface, whereby the spinning support guide provides a point of contact between the grass trimming apparatus and the trimmable surface; activating the cutting mechanism; trimming the cutting surface to a desired height; and moving the grass trimming apparatus along the trimmable surface while maintaining the point of contact.