Using the Makita DHP487Z combi drill is a breeze. First, make sure you insert the 18V LXT battery correctly. Then, select the appropriate torque setting according to your task. For screwdriving, you can choose a lower torque; for drilling, a higher one might be needed. The variable speed feature allows you to adjust the speed based on the material you're working on. When drilling, apply steady pressure. As for safety, always wear safety goggles and gloves. Don't use the drill if it's damaged. To maintain it, clean the drill after each use. Wipe off any dust or debris, especially from the chuck. Keep the battery charged and store it in a cool, dry place. If you notice any problems with the drill, like strange noises or reduced performance, stop using it and have it checked by a professional.