I had one this past March to prepare for my AUS surgery. It is very quick and not that bad at all. By now you should be used to pulling your pants down. That was the hardest part. The doctor gave me some shots to numb the area like a biopsy. The total time with the scope inserted was no more than 10 seconds, then I got dressed.
Just another humiliating moment in the life of PCa patient.
You'll be fine, don't sweat it.
Bill from Florida