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Gawd... These devices are ONLY useful if you and your monitor are sitting under a standardised daylight source at 5,000 deg.K. Otherwise their white point ref is completely wrong. I'm involved in this professionally, and always run purpose-built light booths for our graphic artists. Your bedroom desktop is hardly standard, so instrument-driven calibration is generally ineffective, or at best guesswork and compromise. Do your calibration as best you can and bring it in to my office. I'll tell you how far out it still is.
The procedure is still useful if you want to match one out of calibration monitor with another...
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