There is no excuse that I know of to hand hold a camera when
photographing documents. The camera should be on a tripod. Why on earth would a tripod not be used? Is the document in a hurry?
Set up the camera on a good tripod. Make sure it is perfectly parallel with the document surface. Position the document, and be sure it is flattened with respect to the camera. Add lighting, and take the picture. A high end Nikon does not confer any advantage. A low end DSLR with a good wide/wider angle lense which is properly focused will do the job.