Oh, really? Let me reset my camera and let you try. Do you know about the science and maths of light, distance and depth? What about what lens produces which effect in what set up and focal length? How about ISO and positive and negative exposure, double exposure, long exposure. Let's not even get started on camera models, equipment or post processing and the planning involved before the photograph is even taken. If you think its expensive to hire a photographer, wait until you have hired an amateur! Photography is not just the technical side of things either, there is an element of art to it that means only that one particular person can cast their subjectivity in the image and make it how it is. It can take years for a photographer to fully understand what it s they want in an image and then just exactly how to make it happen.