No videos, the vet demonstrated the giving -fluids process for me.
But I can remember thinking that I would NEVER be able to do fluids, until Scruffy was diagnosed with cancer and kidney failure, and all of a sudden, I was giving him fluids two times a day. He never objected in any way, which kind of surprised me. We had a regular routine, with a plushy towel folded up under his favorite kitty pi on the kitchen counter.
The one thing that seemed most important to me, after I got over the incredulity of the idea that I was going to do this awful thing to my beloved cat and after I bought GOOD NEEDLES - TERUMOS (20's or 22's, I believe), not the crappy scratchy harpoons the vet gave me - was to make sure that the fluids were warm enough. I bought a thermometer-type thing - it was sort of shield-shaped, and intended to be just held against the skin, not inserted anywhere. When I first started giving Scruffy fluids, I was aware that the temperature was important, but it took me a couple of days to realize that he was occasionally shivering during the process. Once I got the thermometer and could make sure the temperature was around 102 degrees (cat body temperature?), he seemed even more comfortable and relaxed. It just became a time when I could concentrate on him without distraction, and talk to him and pet him and love him. It still gave me a kind of jolt to think about poking such a huge needle into him, but you know, you do what you have to......
One other thing - Scruffy had really long, fluffy fur, and I had the vet shave his scruff/back in the target area so I could really see what I was doing and so I didn't keep poking him in the same place every time. It didn't look so good, but it really helped.