To fluff a Christmas tree, start by carefully separating the branches from each other and fluffing out the individual needles. Make sure to take care not to break the branches or damage the tree. Once all the branches are separated, use your hands to fluff out the branches, making sure they are evenly distributed and creating a full, fluffy appearance. You can also use a comb or brush to further fluff out the tree, but be gentle and avoid using too much force. Finally, step back and admire your beautifully fluffed Christmas tree!