Clean the existing surface of the fireplace surround to prepare it for resurfacing and ensure good adhesion of the panels if you are using an adhesive installation.
Measure the fireplace surround to determine the size to cut your decorative panels. Account for the space required between the panels and the floor or walls if this is indicated by the decorative panel manufacturer.
Make a plumb line at the edge of the fireplace surround with a chalk plumb line to ensure that you install the panels squarely.
Cut the panels to the proper shape and size, using a fine-tooth circular saw.
Apply the decorative panels to the fireplace surround. Some decorative panels can be attached with an adhesive, while others can be screwed on, depending on the product and the surface you are covering. Refer to the manufacturer's instructions for the proper installation procedures. In general, there are three possible methods. To use a cartridge adhesive, load a cartridge of adhesive into a caulking gun and run a bead of adhesive around the edges of the panel and in vertical lines every 12 inches before pressing it on. Reinforce with nails or screws. You can also apply a layer of adhesive with a 3/4-inch trowel held at 45 degrees. Allow the adhesive to become tacky (five or 10 minutes) before pressing it on. The third possibility is to drill holes at intervals around the edges and screw the panels to the surround beneath.
Caulk any screw or nail holes and seams to hide them and get a polished look.