The easiest popsicle mold to work with is one made of silicone, instead of hard plastic. With the silicone mold, all you need to do is stretch the sides out to break the seal, then press up from the bottom to release the popsicle. You don't even need to dip the mold in warm water beforehand! This is especially important for popsicles with a softer (rather than icy) texture. You can also look for a silicone popsicle mold that comes with a lid, with spaces for the popsicle sticks. That way, the sticks are easily held into place (without having to wait for the popsicles to partially freeze first). And, the lid will also keep the popsicles fresh in the freezer, if you want to use the mold for longer-term storage.