i would get a valve tool of some kind . i have the caps that have the valve tool built on .as for the tire if its split rim will it come out after the bolts are out ? if not i would put the bolts back in and set the rim on the ground and step on the tire put your weight in the rubber not the rim .then put some kind of lube on the bead , dish soap works great, wd 40 , the cheap lubricant stuff from wally mart. if you cant get it to pop off the rim do you have a bench vise ?if so take your rim and put it in the vise now be careful work slow and look for you can crush things .put the jaws of the vice on the rubber near the bead . make sure you dont have the metal of the rim in the jaws slowly tighten the jaws up watch the tire it may or may not move if you get it to move a little spray in your soap or oil of choice . now loosen it and turn the tire a little bit and re tighten the vice and more lube repeat this all around the tire. now watch that you dont try for too much at one time you can wreck a rim . just a little at a time and keep trying for a little more each time .i have changed car tires on a metro using a vice . but sometimes the bead will not pop you will have to cut the side wall of the tire and then cut the rubber off the rim . if it looks like your going to bend something then stop .