The primary challenge of studying microorganisms is their invisibility to the naked eye, making direct observation impossible. Scientists overcome this by using microscopes to magnify them. They also use techniques like culturing (growing them on nutrient media in petri dishes) to isolate and multiply them into visible colonies, allowing for macroscopic study. Staining techniques are used to make them more visible under the microscope and differentiate between types. Molecular techniques (like DNA sequencing) allow identification even without culturing.