To fluff a Christmas tree, start at the top and work your way down. Use a broom or a specialized fluffing tool to gently lift and separate the branches, adding a touch of lightness and fullness to the tree. Then, gently shape and arrange the branches to your desired effect, ensuring the tree is evenly fluffed and no areas are left bare. With a little effort, your Christmas tree will be beautifully fluffed and ready for decorating!