The thread on pain after ablation reminded me. You might find this funny. I did, in spite of the experience.
Before my ablation I was entered into a trial for Dofetilide. After some days and with it not converting me on its own, I was scheduled for a cardioversion. They took me down to theatre (in AF, obviously, and remember, mine was vagal AF so biggest episode risk is from low heart rate) and a young and clearly new-to-it doctor tried to put my canula in.
He didn't manage to do this very well. I seem to remember he got in once but had not hit the vein correctly, so he tried again. Big ouch. REALLY big ouch. So by this time he had hurt me so badly....
.... I converted. They didn't believe me when I told them until they actually checked my pulse.
So I never have had a cardioversion