I would suggest going to a Tire Shop. You could try pry bar, but would not reccomend as to possibly damaging your rim and possibly a few teeth. They have machines that make it easy.
I would second the opinion of taking your vehicle to a tire shop. They have equipment that will make short work out of changing your tires. They could have all 4 tires changed, balanced and back on the vehicle before you could one tire off the wheel.
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