I helped my friend cut off the scurs off one of his bucks using this type saw. To use the cutting wire, it needs to make a sawing motion(back and forth). That is what the handles are for. We put the buck on the stand, put the cutting wire at the base of the scur, and cut it as fast as we could. I must warn you, this is a procedure that can go wrong. The horns of a goat are connected to their sinus cavity, and after you cut, there can be a lot of blood. The blood will come out of it's nose as well. We used a dehorning iron to try and calderize where we cut. It really didn't work that well. We also covered the area with flour and stuck toilet paper in it to absorb the blood. That buck was very pale and lathargic for several weeks. He had called a vet about doing this, and some wouldn't even do it, and others said sedation was required.
IMHO, if you have an expensive buck, I wouldn't do this myself. It would best be preformed by a vet with anesthesia available. i must also say, it seemed pretty painful. I would have never tried it on one of my animals.