Patrick, you'll need to jack up the tractor to remove lug nuts or bolts to remove the wheel. Special tool? Impact wrench sure is nice, but a socket and long enough handle can do it. You need a valve core tool to remove the valve core to deflate the tire. They're cheap at any auto parts store. Then you have to break the bead loose on both sides. Special tools are made for that, in several different styles, manual or air powered. But in a tight, I've laid a wheel on the ground and carefully driven the front wheel of a car or pickup across the tire as close to the wheel as possible without actually getting on the wheel. Then you turn it over and do the over side. Then you need a couple of tire irons, although really big screwdrivers can be used in a tight. When you start to put the new tire on, it goes easier if you lubricate the bead with soapy water. And then you need a rubber mallet in most cases, although it's possible (but not a good idea) to use a hammer instead. Are you going to put tube type or tubeless tires on it? If a tube, just get the tube in before you put the second side of the tire onto the rim, get it straight, with the valve stem properly lined up and in the valve stem hole of the wheel. If you have the right tool for removing the valve core, it can be used to hold the new valve stem in place. Just make sure you don't pinch the tube in getting that second side of the tire onto the wheel. I'd air it up without the valve core in it, then let the air out to let the tube relax and be sure it's straight, then put the valve core in. If it's a tubeless tire, you may have a problem getting it to take air to seat the bead. Again, special tools are made, but in a tight, you can wrap a ratcheting strap around the center of the bead, or use the cable on a come-a-long wench to squeeze the center of the tread in, which will expand the bead outward to seat on the rim. You have to remember to start loosening that as soon as the bead seals and the tire starts to take air.
Nothing to it, when you've been doing it a few years. /forums/images/graemlins/wink.gif /forums/images/graemlins/laugh.gif