Hey STEPHSHUBBY, great job that your making sawdust, that is an accomplishment in itself.
About the blades, and I'm sure better answers will follow, but 1. 3/4" is in the thicker side for scrolling so make sure you are using the proper size blade. FDMIKE can guide in the right directionon on that.
2. Breakng blades is part of the "fun", not really, but its going to happen. Sometimes a blade will last a while, and other times the same size blade with the same wood and tension will snap quickly. Just work though it
Remember, you having fun, learning and making sawdust...Good Luck!