My new MTB is the first bicycle that I've owned in almost 20 years. I don't remember tires being so difficult to take off of the rim - although the wheels on my last BMX bike were made of plastic - Tuff wheels. I have Tioga 26X1.95 tube type tires on Black Eye rims. As suggested by the dealer, I bought a set of three plastic tire tools. I've been using the tools as indicated by the directions included with them and it's taking me over ten minutes to remove a tire from a rim. And it seems to require a lot of force. Tonight I broke the tip off of one of the tools. I've watched people dismount a tire, patch the tube, and remount the tire in less time than it takes me to just get the tire off the rim. What's the right technique for removing tires? Thanks in advance.