Using the DeWalt DWHT83195 36-Inch Heavy - Duty Large Trigger Bar Clamp is a breeze. First, open the clamp to the desired width and place it around the objects you want to hold. Use one hand to operate the trigger and apply the 300 - pound clamping force. If you need to use it as a spreader, just press the quick - change button. When using, make sure the jaw pads are in place to protect your work surface. As for maintenance, after each use, wipe it clean with a dry cloth. Keep it in a dry place to prevent rusting of the steel parts. Also, check the jaw pads regularly and replace them if they are worn out. With proper use and care, this clamp will serve you well for a long time.