Leveling an uneven board can be accomplished by following a few steps. Start by identifying which area of the board is higher or lower than desired. If it's just a small portion of the board that needs leveling, sanding it down using sandpaper or an electric sander can often do the trick. However, if the unevenness extends over a larger area or if it's more severe, using a hand plane may be necessary. By carefully and steadily shaving off thin layers of wood from the higher parts, you can gradually bring them down to match the rest of the board's level.