Gotta answer this one too. I had outpatient tkr.... in at 6am, home by 1pm. I asked Dr about something going wrong. Along with the fact that the hospital is right next door, he basically said the screenings I had had done told him that I was a good candidate for this outpatient surgery, so their experience tells them who would be good for that kind of surgery. It also depends on the answers you would have given him at some point.
As to the pain medications, I did have to call the following morning (Saturday), and the PA called back within 10 minutes. He told me what to do (double the oxycodone) and call back if it did not help.
I would definitely do it outpatient again if I had too. Even though I had no one at home after the weekend (didn't really need them), I would still prefer to be at my own comfortable place where I can get up as needed and not have to wait for someone to bring me medications, or worse, totally ignore me ringing for them. I had everything set out where it was easily gotten to, and could carry it to the place I was sitting/lying down. Even a light lunch of soup was managable.
So.... it all boils down to you. I suppose I could have insisted on a hospital, but I was all for outpatient if it was possible. With you having someone there, if you had to call and they gave a new medicine, you have someone to run out and pick it up. If you are truly uncomfortable with it, mention it to your dr, but I think you'll find you will be ok. They don't release you until you have reached certain "milestones" after recovery. Hope this calms your fears.