There's an easy way to get the tire off without using tire levers. First, put the tire on the ground and start pressing the inside of the bead into the center of the rim. Once you've gone around the rim, put the valve on the ground, and pinch the top of the tire and push it forwar until it pops off of the rim.
To put it back on, put on side of the tire bead in the center of the rim. Put the valve back in, put it on the ground again and pull the tire back on the rim. Be careful not to pinch the tube.