Don’t let the title scare you, there’s no need to purchase expensive equipment. You can create your own display profile using calibration hardware that can be easily rented. Whether it’s for the internet or for printing, calibration hardware can help you get more accurate colors in your photos in the future.
A photographer may be able to edit world-class photos, but if their monitor alters the way certain colors look, the result will be far from desirable. Even if the user doesn’t see this, others will. Fortunately, there are ways to calibrate your monitor to go from color approximations to accurate results.