Chainsaw, just like in the video. Used eye, ear, and hand protection (special gloves). Wedge was not perfect, but since I started with that was able to fix it. Back cut aim was off, but again I was able to redo it in time. Wouldn't budge, so cut backcut deeper. Still wouldn't budge, so I cut it deeper. Started to go in exactly the direction I wanted it to go, so I ran....perpendicularly to the fall. It fell with a satisfying "thud". Wonderfully cathartic. I think I might cut another piece for a shelf I'm making.