I think it depends where the wound is too.
I had almost no pain with the open surgery, but the catheter was a nightmare - 8-10/10 pain level. I was initially dismissed (just get used to it), but the pain was real. The catheter injured me and it moving all the time was excruciating. Stricture developed because of the injury and eventually a manual dilation in hospital was required. That pain was 12 out of 10. No pain killers given. "Wire" essentially inserted and expanded several times. I will NEVER go thru that again. Stricture returned (tip of penis) and I had a urethroplasty. Recovery extremely painful. Any movement or brushing of clothes hurt. I'm conditioned to the pain now, in that I feel it at times even when I shouldn't. Any insertion of catheter is torture - my mind still remembers the pain from the catheter,manual dilation and the slow recovery from the urethro.
But the positive side is I escaped pain for the actual open surgery itself. I think location of injury and whether you can isolate that spot from being touched is the key.
The way we found my stricture was when the uro couldn't get the scope into my bladder. When he bent over me, putting his shoulder into pushing it in that I finally had to let my feelings be known about
his techniques. (Let's just say I wasn't his favorite patient)
My bladder spasms made passing kidney stones feel downright pleasurable. (Think "muscle cramp" that lasts 12 hrs)