Updated August 2016
This tutorial is specifically for users of the ColorMunki Display. It is the exact same steps whether you're using macOS or Windows. If you use a Spyder5Pro or another version of that, this tutorial won't be the same, but you'll be able to follow along and pace yourself through it. If you have any questions, just post them in the comments below.
Please Note: The new Night Shift feature in macOS 10.12.4 changes the colour temperature of your display. This will affect the colour of your images and mess up your edit. I advise you not to use it, it is turned Off by default. It can be found in System Preferences > Display > Night Shift.
The First Step
You'll most likely have received an installation disc in your box, you can ignore that as it is out of date. Go to the X-rite website, click Software Downloads and the version for your operating system. Once that's installed, open the program.
Open the preferences. ColorMunki Display > Preferences. Have a look at the screenshot below and make sure your settings match.
Plug in your colorimeter and where it says Technology Type, select from the dropdown menu White LED. If your computer uses USB-3 the colour calibration device may not be recognisable by your computer. If this is the case, you'll need to get yourself a USB-2 USB hub and use that instead. I have a MacBook Pro that uses USB-3 and I have to use a hub. I also have an iMac that uses USB-2 and I have no issues with it. For more details on this issue, click here.
Once you have completed that, you can click Ok. You'll be taken to the main screen where you'll choose Profile my Display.
Choose the Advanced (Photo) option, set your White Point to Native and choose a brightness level of around 90 to 100. This is the brightness of your screen. You'll want a brightness of between these two numbers. It may seem darker to what you're used to but after a while you won't even notice. I have my Macbook brightness set to 120 cd/m2 (Candela per square meter). This equals to 7 dots below full brightness on the Mac's keyboard brightness control.
Once you hit next you'll be taken to an Advanced Options screen. By GOD! keep those two check boxes disabled! These allow the brightness of your screen to automatically adjust based on the lighting atmosphere around you. This is detrimental to colour accuracy.
Now place the colorimeter over your screen until it fits within the yellow boundaries. You can move the window around but try and keep it as centered as possible. The colorimeter needs to be perfectly flat against the screen, so you may need to tilt it back a bit.
Your monitor will now begin to flash different colours and intensities. This may take a couple of minutes.
After the ColorMunki measures the contrast of your screen, you'll be asked to manually adjust the brightness of your screen to get as close to your target brightness as possible. It doesn't need to be spot on, as the calibration process will automatically adjust the brightness further to get it perfect. This changes your brightness beyond the control of your keyboard buttons. You must not change the brightness once you've calibrated. Simply hit Next and for the next couple of minutes the calibrator will do its magic.
Once it has completed its colourfulness, you can save the profile and give it a name. I've chosen to name it the monitor/computer I'm using 'iMac', what white point I used 'Native' and what the brightness level was set to '90'. The name would then be "iMac_Native_90". Now hit save and you're done.
You'll now want to follow this tutorial with a fresh RAW file, then send the image off to print. Once you receive the print you can then compare the print to the image on screen and hopefully your images match to an acceptable state... They won't be perfect. You could also compare it to some older prints in the mean time. When comparing your on-screen image to the print, make sure you're viewing the image in Photoshop and NOT one of the default picture viewer programs as they aren't colour managed and do not render colour accurately.
To compare. Sit a decent distance away from your monitor and compare your print in regular room light. Don't sit your print next to the monitor. The print will be darker than on screen, this is because the image on screen is omitting light and the print is reflecting light. As long as the colour is similar and you're happy with it, your calibration is successful. If the image is too dark or too light, you may want to recalibrate and re edit your image.