Cat Things....
At one point, we had to give our cat 'water injections' under the skin (5 minutes process that is really uncomfortable for the cat) for kidney problems and it was difficult... until we starting using specific room and that was the only reason we let the cat in there (ever). And, it became 'routine' for the cat that when she was in that room, she needed to just sit there... conditioned her over 2 months.
We noticed that when 'we' gave her the injections ourselves at the vet she was very manageable, but at home, she was just a bit too comfortable on her own turf and ready to fight it. We selected a bathroom, changed the smell with certain cleaning solution we only used there and unique air fresheners. .. worked for us when we thought nothing would ever work... on the other hand, you could buy some welder's gloves.