Using the Milwaukee 6141 - 30 angle grinder is easy. First, make sure you're wearing proper safety gear like goggles and gloves. Plug it into a suitable power source. You can use it for grinding, cutting, and finishing tasks. The 3 - position side handle gives you different grips for better control. To change accessories, you don't need a wrench as it's tool - free. Just follow the simple steps to remove and install new parts. For the adjustable guard, you can quickly set it up or make changes according to your needs. When it comes to maintenance, keep the grinder clean. After use, wipe it down to remove dust and debris. Check the brushes regularly, as they have a long life but will wear out over time. If the grinder starts to perform poorly, it might be time to replace the brushes. Also, make sure to store it in a dry place to prevent damage. And always refer to the owner's manual for detailed instructions and safety information.