I have one, but haven't downloaded it yet. It's really a useless skill. It's super easy at the surface because you just slip out from under it, but underwater you don't want to ever kneel for anything, and since this skill is easier when you're horizontal, unless you have a specific reason to pull it up over your head, there is no point.
The basics of doing it though are similar
Follow all steps above, emphasis on getting the rig about neutral. Left hand reaches back and pushes the bottom of the tank up, right hand grabs the shoulder strap right at the plate, left hand reaches up and does the same, then pull it over your head. It sucks if the bc isn't neutral because it sits on your head which isn't particularly comfortable. Again, completely useless thing to do under water, and doing it horizontal gives the same equipment comfort skill, but adds in being able to stay neutral during a big swing in gear