All right, I watched the linked video on YouTube, and a related one where a show judge twisted the spurs off a bantam roo using just her fingers. (Must be one tough lady, I sure wouldn't want to get pinched by her!)
So I went out this evening to de-spur my roosters. Some of them have grown long, thin, sharply pointed spurs, others have thick, long curved ones. Some of my hens are awfully bare-backed, a few look like they've been getting electrolysis.
It really was as easy -- for me -- as described, just grab the base of the spur with the pliers, gently twist back & forth until you feel the pop of release, and pull off the sheath.
The only difference I encountered was the bleeding. In the video the man says there should be "just a drop" -- even though the bird he was holding was bleeding a bit more than just one drop. My roos bled even more than that, so I had the can of blood stop powder handy. I know the bleeding will stop soon, but it continued to bleed even through the powder.
But it will all be worth it if it gives my hens' backs a break, and they can grow feathers there once again.