Hi folks. Actually the prep was the worst part: swallowing litres of stuff etc. Very thirsty and headachey. But they knocked me out and I had a good sleep and woke feeling 100%. Not problems were picked up.
So really I think it is best to do both at the same time. That way they will put you under.
I asked the sister before the time but my Afrikaans left me in the lurch as it sometimes does. I asked her "sal hulle my uitsit?" which means "put down". She had a good laugh and said generally they don't put the patients down.
Bizarrely, it was actually all-in-all quite a nice treat for me. I felt "pampered" and didn't have to go to the office, plus my husband was extra nice to me. Win-win