Using the DeWalt DW0521 is a breeze. To change between fastening and drilling, just use the 1/4" hex quick connect. It's very easy! When tightening, you can do it with one hand thanks to the single sleeve design. For maintenance, keep it clean and dry. After use, wipe it down with a dry cloth. Avoid using it in extremely wet or dirty environments. If it gets dirty, you can use a mild cleaner to clean it gently. Also, check it regularly for any signs of wear or damage. If you notice anything wrong, stop using it and get it checked by a professional.