Use a pastry bag tip, toothpick, un-bent paper clip, hairpin, or, my favorite is an orange stick (as for manicures). Insert whichever tool* you choose into the stem-end of the cherry. You should feel it hit the pit. Push out the pit.
Twist your implement of choice around the pit and pop it out. It will take you a few cherries to get the feel of it. Be patient. Experiment a bit for the twisting motion that works best for you, and don’t worry about the mangled mess those first few cherries may become – they’ll still taste just as good.