My rods are K&S as well, picked up from a hobby/RC store.
What I do, is before cutting off a length or anything, peen one end of the rod. I hold it in my hand, maybe rest one end on my pants/belt while I am watching a movie, and just have at it. I have a 2oz polished ball peen hammer.
My first set of pins though was a disaster.
I used a 16 ounce framing hammer, and used heavy taps.
It basically folded the brass over instead of mushrooming it.:(