This video left out something super important and the person doing video did this wrong, that washer under the nut is not a washer it is a spacer that must be placed around the splines on that shaft before the nut is tightened, you can see in video how it was not centered
Follow the instructions as shown in the video. You'll need a 22mm socket and an impact driver. It will be difficult without an impact driver but should come off fairly easy with an impact driver.
If you are using an impact wrench to break the nut loose, a ½” impact should work better than a 3/8”. A pneumatic impact will typically work better than cordless. If this still doesn’t work, some people have had luck wrapping a ratchet strap around the clutch and tying it off so that it will not spin.
