I had a Sacro Spinous fixation on 1st July. I was in hospital for two nights, the first day I had a pack and a catheter. I was dreading the catheter coming out and like you fearful of water works problems. I had none. All was fine, and I can't tell you how (12 weeks on) wonderful it is not to have a sagging undercarriage. I don't think I realised just how debilitating I was finding it. I took it easy for the first two weeks, (Wimbledon luckily) and then felt fine. I was, and am still being, careful about lifting and general overexertion. Very good luck with the op - you will feel SO much better for it.