It's very easy. It requires no technical skills. You must have a calibrated mic and an ADC. IMO, a good place to start would be the TASCAM US-366 and the emm-6 cross spectrum labs mic. That's what I sent Lee to get him going. You can get even better results with more expensive gear but that's really not necessary.I'm very interested in this.
Can someone please let me know how difficult it is to use?
http://www.amazon.com/gp/aw/d/B00BG6ZM8W/ref=redir_mdp_mobile?pc_redir=1387631617
http://www.cross-spectrum.com/measurement/calibrated_dayton.html
The software is free to try for 14 days.
http://www.dirac.se/en/consumer-products/dirac-rcs.aspx
The really nice thing about DIRAC in terms of ease of use is the ability to use a different device for the input(mic ) and output( test signal ). The software compensates for the 2 different clocks.