Using the Greenlee 438 - 5H fish tape is easy. First, pick the right length and profile for your conduit fishing job. Feed the tape into the conduit starting from one end and gently guide it through. When you feel resistance, don't force it. Instead, try adjusting the angle of the tape. As for maintenance, after each use, wipe the tape clean to remove dirt and debris. Store it in a dry place to prevent rusting. Also, check the tip regularly for any signs of damage. If it's worn out, it might affect the tape's ability to pass through the conduit smoothly. Be careful when handling the tape to avoid cuts from the sharp edges.