Hi i can't help on the cold side but i did have Brachytherapy in 2016 and it is very easy operation to have.
I was taken into Mount Vernon on a Sunday by my wife and daughter and put in a room on my own as the operation is putting radioactive seeds into you and you need to stay away from women and babies of a while.
The only real problem i had is that they could not find my notes, so a doctor went through all my details with me and hoped the notes would turn up in the morning .It was lunch time on the Monday and i was given some pre meds and wheeled across the car park to the operating theatre was given a needle in the back of my hand,My surgeon had found the notes and the next thing i remember was waking up and being offered a cup of tea.
I was wheeled across the car park again back to my room given a couple of pain killers and some other pills and that was it.I was ok to have food and was given a bottle to wee into that they had to check for any lost seeds.
I was told that as soon as i could pass water ok i could go home,I used 16 bottles that where left on the window sill till the next day when i was allowed home.I walked to the car a little sore but no real problem.
Don't worry about the operation ,good luck.If i can answer any more question please ask.
John,