Using this LED strip is easy. First, decide where you want to install it. You can cut the strip to your desired length at the marked 17.5mm intervals. Just use a sharp pair of scissors or a cutter. If you need to join pieces together, you can re-solder them using the solder nubs. Connect the red and black power wires to a suitable 9V - 12V power source. Make sure the power is off when you're doing the connection. When it comes to safety, always handle the strip with dry hands. Don't expose it to water or high humidity environments. To keep it in good condition, clean it gently with a dry cloth every once in a while. Avoid using harsh chemicals as they might damage the LEDs. Enjoy your new lighting!