Hi there
I agree the taste isn't so bad but I find that I had to keep going through a lot of the night. It does as you say calm down and you go a little at a time at least in my experience. If you have drunk the prep and followed the instructions re not eating etc you will be fine.
The procedure is fine too as you're sedated - the worst thing is waiting for your turn because you're tired and hungry. Hopefully you won't have a long wait. Good luck. I am sure you will be fine.