I almost always hunt out of a treestand. Like has been mentioned earlier, get a harness. I use a Locon Windwalker 95% of the time. They are small stands but they keep you tight to the tree which eliminates a big mass hanging off the side of a tree, therefore reducing the chances of being spotted.
I try to get some cover between me and the ground, between me and the sky, and only a little to the sides. This lets you have a larger area to move your bow, i shoot a 66" LB. Remember, higher is not always better, wind is funneled through trees, and just because a tree offers more shot opportunities don't mean that it's the "killin' tree".