If you're working with an artificial Christmas tree, fluffing is a simple process that can give it a more natural and full look. To fluff your tree, start by spreading out the branches to their full width and length. Then, take each branch one by one and gently pull them upward, making sure to distribute them evenly around the tree. Once you're happy with the shape, you can use a broom or a wire brush to gently comb out any tangles or knots. And finally, if there are any bald spots or areas where the branches are too thin, you can always add a few extra ornaments to fill them