You will have to know the operation of the power tool and know how to fix it while needed. You can grind, cut so many materials with changing different kinds of discs. 1. At first, you will have to unplug the power cord from the switchboard. 2. After that, you can use a wrench to give tight to the angle grinder. 3. You can also use the wrench to change the wheel of the angle grinder. 4. You will have to tighten the angle grinder properly. 5. If you do not tight it properly then, your machine will not work smoothly.