Using the GearWrench 81208T ratchet is quite simple. First, select the appropriate socket that fits your fastener and attach it to the 3/8-inch drive tang of the ratchet. Then, use the on/off switch on the head to set the direction of the ratchet for tightening or loosening. The 90-tooth gear allows for a 4° swing arc, so you can turn the fastener even in tight spaces. When using it, make sure to apply a steady force to avoid slipping. As for maintenance, after each use, wipe the ratchet clean with a dry cloth to keep the bright chrome finish looking good. Since it has an enclosed head design, it's quite resistant to dirt, but try to keep it away from excessive dust and debris. If you encounter any issues, you can use the 81227T repair kit. And remember, this ratchet comes with a limited lifetime warranty, so you can use it with confidence.