I had this a few years back - no metal work, and was done as an emergency; a thumb sized piece of disc had got loose and was cutting off a nerve. Apart from a few stitches it wasn't any problem, in fact i was home 24 hours later and back onto my smallholding about four days later lugging 25 kg sacks about; my wife phoned the consultant about me doing this and he was fine with it. Once they trim the disc nothing else needs time to heal - other than the few stitches they make in the wound.
I am not sure if metal work complicates things and i had developed very strong core muscles before, during and after.
Good luck. i'm sure that it'll be fine and man, compared to that white pain of sciatica - well, i mean anything has to be better than that.