Using the Klein Tools VDV201 - 040 Crimp Die Set is easy. First, make sure you have the right cable type - it works with RG58, RG59, RG62, RG174 coaxial cables and fiber optic ones. Remember, this set is only for use with crimp connectors, so don't try to use it with compression connectors. The die set is designed to be used with Klein Tools Cat. No. VDV200 - 010, which you need to buy separately. When you're crimping, the precise nest dimensions will help you get accurate terminations. Just place the cable and connector in the right position and apply the necessary pressure. As for maintenance, keep it clean and dry. Since it's made of induction - hardened high - carbon steel, it's durable, but avoid using it on materials it's not designed for to ensure a long life. And always check the nest dimensions to make sure they're still in good shape for accurate results.