Quoted:
Can you do that when they're younger?
The reason I ask is because when I used to stay on my uncle's farm back in the mid 70's I helped castrate a lot of little piggies. He did them before they dropped when they were still really young. I'd stand there holding both their right legs in my right hand, both left legs in my left hand, and upside down. My uncle would use a simple straight razor to make a slit, and pop out the nuts and cut them off. He also used wire cutters to trim a couple teeth, and cut the tail off too.
I usually castrate and burn the horns in the first few days.
It takes about 15 seconds to castrate them; you cut the bottom third of the scrotum off completely, then wrap the cord around a finger and just yank it out, repeating for the other side. It cuts down on bleeding and infections to pull it out rather than cut it.
ETA: No anesthetic. Scrip only and it's a lot harder to use than you think.
Why cut the goats? If you ever smelled a mature buck you would know. Rank doesn't tell half the story.
BTW, an intact male goat is a buck, not a billy. One that has been castrated is a wether.