You can spend the bucks and mount a tire changer to the floor taking up valuable space, or just grab a few short lengths of 2x4 and a 2x6 about 5 feet long. This is all you need for breaking your tire bead. First thing to do is remove the valve stem Next set up the wheel so the brake rotor is protected from hitting the ground. Stand next to the wheel and jump onto the 2x6 close to the tire. Use a little follow through and you can easily achieve the desired result. Flip the wheel over and break the other side loose the same way. For rim protectors,I have had the best results using two rubber sheets that are 1/8" thick ,4 wide and 10 long. I insert the sheet between the wheel and tire iron. The large surface allows the iron some leeway in movement with no fear of marring the wheel. Start (and Finnish) prying with the irons at the part of the tire farthest from you , using your knees to hold the tire closest to you in the middle of the rim. Use lots of soapy water to help. Getting the second bead over the rim is tricky. I usually use 1 iron and a knee to peel the tire off. When installing the new tire , the first bead will pop on with no tools , just soapy water. The better job you do keeping the tire closest to you in the rim "valley" , the less force it will take to pry the last bead on. Leaving the tires sit in the sun prior to starting makes it essayer too. I Finnish up using a home made balancer setup. ALWAYS use a torque wrench on your wheel studs and brake calipers.