I had Calypso markers inserted, which are much the same size and the same function as the gold markers in the RT process.
There were three insertions in my prostate bed tissue (my RT was adjuvant, meaning that my prostate had already been removed). Each was more painful than an equivalent "punch" for the biopsy, but there were only three as opposed to twelve.
They could have offered me a pill to sedate me, I suppose, but being alone, I had to be able to drive home afterward. The process was the same as my biopsy. Anitbiotic before and after, twenty minutes or so in the office.