Sensor cleaned and all seems ok I had to have two attempts before it was totally clean. After the first clean it looked spotless. However, I took a couple of shots using the smallest aperture and the longest focal length (I believe that's how you check for dust spots) and found two very dark spots remaining. I tried a different lens, just to be sure, and they were still there. A second clean, with a little more pressure added, was called for and another couple of test shots showed the remaining dark spots had gone
I didn't find the process particularly daunting or difficult but if it was a 5D for example then my hands may have been shaking a little more! I wouldn't have any hesitation if/when the need arises again.