Many of us might already have a citrus reamer hiding at the back of a kitchen drawer and not be entirely sure what it's for. Others of us have never heard of one or seen it used. But we ALL can get one inexpensively (here) and have fun making sure we get every last drop of juice out of a lemon, lime, or orange, for example. You could also opt for a citrus squeezer, or a proper juicer. Don't settle for trying to squeeze all the juice out with one lonely little hand as I've frequently seen some folks do. Get your ream on! Don't fear the reamer!
Here's a great video showing you the actual technique.