For tubeless type rims it really takes some type of machine usually to at least break the beads, for a tube style rim the tire beads should compress easily once the air in the tube is released. Then the process is about the same, get one side of the bead to drop into the center well and the other side will lever out using the tire irons, hold it with one iron and use the other to start working aroung the wheel. Shouldn't take much and it will be free. Remove the tube and then the other bead is a snap.