Oh sorry, I thought you had the lens off the shutter already.
Yeah, take the ring off as described above. Then get the lens off the shutter. It's a 2 part lens and that has to be taken appart once it's off the shutter. One part screws inside the other, the back part stays in the shutter and the front turns via the focusing ring.
Use strap clamps and not your pliers. Some people use hose clamps, that works as well but can mar the brass if it slips and they chance over tightening which can break the lenses inside as well as deform the brass barrels.