The first step in decorating your Christmas tree is to decide on the theme. Will you go for a traditional, classic look with red and green ornaments, or a more modern approach with gold and silver? Once you've settled on the style, start by hanging your lights. String them in a pattern that will complement the rest of your decorations, such as wrapping them around the tree in a spiral or arranging them in a zig-zag pattern. Next, add your ornaments. Try to mix and match colors and shapes for a visually interesting look. Finally, top it off with a star or an angel to finish the look.