Using the Pimoroni OmniVESA is a breeze. First, remove the protective backing from the OmniVESA. Then, follow Pimoroni's instructions to mount your Raspberry Pi. You can choose to mount it bare or put it in a Pimoroni case or some other supported cases. When using the nylon screws, note that they're long enough for all relevant cases. If they stick out too far from your case, you can use pliers to trim them down. But don't forget to wear eye - protection when cutting. As for maintenance, keep the OmniVESA and its parts clean and dry. If you're not using it for a long time, store it in a cool and dry place.