Using the GearWrench 82821H mini file set is quite simple. First, pick the right file for your task. For flat surfaces, use the flat file. If you need to work on rounded areas, the round or half - round files are your best bet. The square file is great for square holes or edges, and the triangle file can handle sharp corners. When using the files, hold the handle firmly and move the file smoothly in one direction. Don't apply too much pressure at once; start gently and gradually increase as needed. As for maintenance, after each use, wipe the files clean with a dry cloth to remove any debris. Keep them in the included pouch to prevent them from getting damaged. Also, avoid using these files on extremely hard materials that could damage the blades. With proper use and care, this file set will serve you well for a long time.