Question about Dixon mower tires

I have a Dixon ZTR 4515. The front right tire has a slow leak. I sprayed it with soapy water, including the rims and valve stem, but can't find the leak.
So I bought a new tire, and I'm wondering what the technique is for replacing it. I've never worked with tubeless tires. Do I just deflate it and pry it off with a screwdriver? I don't want to scratch or gouge the rim so that it can't seal.
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Seems like you will have to remove the wheel regardless how you do it.
So, perhaps you could take the wheel to where you bought the tire and let them do it. I bought my last tire from NTB and they did the mounting at no charge. I had priced the tire at Walmart and it was about the same except they wanted 8 bucks to mount it.
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