To use the Rothenberger SV Press Sling Set V2, first make sure your pressing machine has an axial thrust force between 32 - 34kN. Place the fitting you want to press securely. Then, position the press sling around the fitting as per the machine's instructions. Start the pressing process and ensure it's done smoothly. As for maintenance, keep the press slings clean after each use. Wipe off any dirt or debris. To avoid corrosion, store them in a dry place. Also, regularly check for any signs of wear and tear on the press slings and replace them if necessary.