Please take care in just reading the operating manual and practicing. Many years ago when I started IR, I had the manual read, weeks of practice then level I training and it still took me many months to become comfortable interpreting the images. Yes, most anyone can find the on/off switch, get a pretty darn good image and figure out what is happening, even the sales reps tell you that but to really understand the camera, tune it and make proper interpretations, training from a competent individual is vital. I’ve provided presentations to many interested in starting thermography and always have many in the audience who had no idea the complexities of infrared thermography. As a home inspector you all know the value of knowledge and its key to a successful inspection. One that the client will not come back to haunt you due to failure performing the inspection effectively. Experience is great, but with necessary training and instruction as well.