Welcome to the Bunnings Workshop community @John1934. We trust you'll get loads of helpful information, advice and inspiration for all your projects around the house and garden from our wonderful members.
As mentioned in the product video below, the Ozito 800W Constant Pressure Pump comes with installation instructions and the pressure head is already assembled so it's very easy to get going. Was there anything specific we can help you with? If you could please let us know what you are having trouble with, we'd be more than happy to assist.