Tate, we all know how you feel. Been there....done that.......
The BCG procedure really IS simple. I was as worried as you, but within a few seconds, the Doc got that catheter in and the bottle attached, dumping the chemical in. The catheter comes out easily as well. If you are still hurting from the cysto, that prob. is what we all had. I can tell you my plumbing is still a bit problematical and my tumor was removed 3 wks prior to the first BCG.
They have you roll on both sides to get the chemical all over the inner lining and then you start drinking water to re-hydrate. That's all there is to it! Piece of cake, although I have been fighting a nasty bladder infection for 7 days now, likely due to "bugs" introduced during one of the treatments. So watch for that.
Oh, one more thing from experience. I can get a little joint discomfort a few hours after, so take a couple Tylenols before and a couple after the treatment to help put off these aches. I have been working every day after each of my treatments....a glutton for punishment?