Using the Klein Tools VDV205-039 Die Set is quite straightforward. First, make sure you have the appropriate Klein's VDV200-010 Insulated Terminals (which are sold separately). Insert the terminal into the die set and position it correctly according to the nest dimensions. Then, perform the termination process. It's important to handle the die set with care. Avoid dropping it or subjecting it to excessive force, as it could damage the precise nest dimensions. For maintenance, keep the die set clean and dry. After use, wipe it down with a clean cloth. If there's any debris in the nest, use a small brush to clean it out gently. Remember, Klein offers a lifetime warranty on material defects and workmanship, so if you have any issues related to that, don't hesitate to contact them.