It certainly was astonishing how much rubbish collates on the sensor. This is like a big relief now, having done it - because previously I knew that for every pic I took, if I wanted to keep it - then I'd have to go through a tedious process of removing the biggest and most visible dust spots. It was a chore and not something I enjoyed. No longer!
Focus to infinity - gotcha, I shall bear that in mind for the future, ta
As for the experience, I was a bit nervous. My first thought on seeing the sensor was "shiney" and then I worried about possibly scratching it but trusted the good stuff to do its job - and it did.
I held the camera upside down whilst using both the blower and the arctic butterfly brush. Took a few goes because after each blow and brush, there'd be one pesky little speck that the loupe would reveal. Eventually I could see no more and quickly turned the camera on and off again to get the sensor covered.
The loupe itself had a few dust particles or something that looked trapped in the glass - but given its directed focus towards the sensor, those couldn't be seen when looking for sensor dust of course.
Overall - not scary at all and very quick to do. As you said before, never having to worry about dust again is a big boon.