Jabe - please stop worrying. In my case I had a spinal block, was out of hospital after 3 days, no crutches after 4th day, a stick for a couple of further days and was doing my usual morning walk to the newspaper shop - a quarter of a mile - after 5 days. I had 4 physio sessions, all that was necessary, and as for the stomach jabs, only three and you can't even feel them. The bruising was wonderfully spectacular though - from bum to toes, purple, green, yellow...
.
The single most important thing you can do is the exercises. Every single one every single day for at least 3 months, no matter how boring and how you feel. By three months I had completely forgotten I had a lump of metal in my knee.
OK - it might not be that easy for everyone, but my experience was pretty similar to several friends who had this done. The only 'bad' story was of one friend who confesses she didn't do her exercises so essentially had wasted the operation.