Installing cornice boards is relatively easy. You should measure the length of the cornice so as to ascertain whether to use more than just two brackets. Then, mark the positions where each bracket will be fixed to the wall. Keep in mind that the weight has to be evenly distributed. Drill the holes and install an anchor in each one. Now, you can attach the brackets at each point by screwing them in securely. Once the brackets have been fixed, place the cornice on them. Then, drill holes through the cornice, so as to attach it to the brackets by means of screws.