Using the Makita Round Die is quite straightforward. First, make sure you have the Makita 18V LXT Cordless Metal Hole Punch model XPP01. Install the 1/4 - inch (6.5 mm) round die onto the punch. Place the metal plate you want to punch a hole in, ensuring it's within the die's thickness capacity (5/64 - 5/32 inch for general steel and 1/8 - 5/32 inch for stainless steel). Then, use the punch to create the hole. When it comes to maintenance, keep the die clean after each use. Wipe off any metal shavings or debris. Store it in a dry place to prevent rusting. Also, always check that the 1/4 - inch round punch is in good condition before use. And remember, the die is only suitable for use with the specified Makita hole punch, so don't try to use it with other tools.