I carry Motion Pro short ones and have changed 5 tires on my ST with them.
If you can get the sharp one between the rim and tire, you'll have it made. Push and wiggle to get it in as far as you can. Then do the 2-irons slotted together and squeeze. You will probably have to work your way all around the tire before it pops. I find going the width of the breaker (1.5") at a time works best for stubborn ones. My last tire, a Mitas EO7+ I had to go all the way around twice...but only on the first side.
Using lube when you remove and put tires on helps immensely. Some use tire lube, others dish soap. I use cooking oil.