Installing closet shelf brackets is similar to installing cabinet shelf supports. Start by measuring the desired height and spacing for the brackets. Mark the positions on the closet walls using a pencil. Align the shelf bracket with the marked position and use a screwdriver or drill to secure it in place. Make sure the bracket is level and tightly fastened to ensure stability. Repeat the process for each bracket, ensuring they are evenly spaced and aligned. Finally, place the shelves onto the brackets, ensuring they rest securely on the brackets. Test the stability of the shelves before organizing items on them.