Sorry about the delayed reply haven't checked my mail for a few days, overloaded with work.
To answer your questions first w0rldd0minator the operation itself did not hurt as you correctly surmised I was under a general anesthetic. I would like to add that I was given the choice between local and general, but this was an episode of my life I was willing to pass up remembering.
As the anesthetic wore of naturally it became uncomfortable, although I think it was partly psychological.
Initially it was a little strange (as you can imagine). I had not been able to retract my foreskin at all due to a second degree phimosos (tight foreskin) so I mis-interpreted the sensation as pain. Walking proved tricky for the first week or so and I decided a week off from anything that didn't involve me sitting down was probably a good idea.
I am happy with my decision and the result is both aesthetically pleasing and a lot more fun than the previous model.