To use this JVC KA - HD250U studio adapter kit with your GY - HD250U ProHD camcorder, simply connect the cables as per the standard connection method. Note that this kit doesn't include an external power supply, so you'll need to arrange one on your own. As the cables may be a bit sticky because of their age, handle them gently to avoid any damage. For maintenance, keep the kit in a dry and cool place. Regularly check the cables for any signs of further wear and tear, and clean them with a soft, dry cloth if necessary.