With the tree upright and hydrated, cut off the mesh and spread out the branches. Most trees will settle and open up over a couple of hours, so you should wait to start hanging lights and ornaments. Then check all your lights for shorts and trouble spots before you string the tree, and never ever put the tree near the fireplace or lighted candles. A Christmas tree is just one flame away from a forest fire. Also, keep glass ornaments higher on the tree, especially in households with small children, who might knock them over an break them. Then enjoy your decorations for the duration, until it's time to take everything down.