Has anyone had a trabeculectomy for high ocular pressure using local anaesthetic?

I think I may have to have this procedure as the pressure in one of my eyes is very high, but am extremely nervous. I know it is explained that you don't see or feel anything, but surely you can see through the other eye? If it takes an hour, how does one keep still for that long? Can you be sedated? I have read so many articles on line that I have terrified myself and would like to hear from someone who has had this done.