Not sure where in the world you are located but my female Grey has just started losing feathers in bulk. I guess she's molting as she's not a plucker. We have full feathers all over the place suddenly like what's in your photo.
That does seem like a bit more than normal. How is the humidity in the room ? Do you,have some soothing music perhaps? Please try not,to,worry, they can sense when you are under stress and will react accordingly. You need to be relaxed and calm around them .
This is so not right. Aggressive birds can be toweled for a nail trim. Sheez!
Please seek someone else to do the trim. This is way over the top in my opinion.