Color management: How to calibrate my monitor?
Here is some step-by-step instructions with pictures to test your monitor. However our eyes (not actually the eyes, but the brain) is very adaptive "device". Calibration with your eyes is like lottery. You may do it better or worse. I recommend you to buy used color calibration device (and sell it after calibration). I did the same procedure few months ago. Only with device you can be sure that colors is matched correctly.