I hope your friend won't find the ablation too stressful. I've had two radio frequency ablations (unsuccessful) and didn't find it too troubling. I had a catheter in the groin. The doctor couldn't get one in the vein in my neck. I just had a local anaesthetic where the catheter went in. I was able to watch what was happening on the computer screens, which was interesting but a bit spooky. I could feel the catheter going up through my body, but it didn't hurt. The 'burns' were quite uncomfortable, you feel heat and pressure. But that was up to me, I could have had some morphine but I'm a bit of a control freak and anyway I was interested in what was happening. Your friend can expect to have a very bruised leg for a while afterwards!
I had both my ablations done as an inpatient and the worst thing about the whole experience was being kept awake all night by noisy nurses. I am a nurse myself and it always amazes me that health professionals so often forget that you are in hospital because you feel ill! I don't think it's too much to ask to be allowed to sleep to help recover a little. (As Ray would say, DGMS). The ablation was quite tireing. You need to rest for a couple of days afterwards. Is there anything in particular your friend would like to know?