If you do not have access to a kit, Windows and macOS has built-in calibration software to help. The manual adjustments do not guarantee that the display is color accurate, but it can be used as a good starting point.
You can find these in most computer stores or online at Amazon or B&H Photo by searching 'monitor calibration devices.' We recommend devices from X-Rite or Datacolor. We highly recommend using a monitor calibration kit to get the best output for your prints. The color of my prints look off from what I saw on my monitor, what do I do to fix this?