I had a similar operation to one the one you need Dazla.
I came off my bike and broke my left wrist in 7 places. As the fracture healed I started to lose sensation in my fingers and they were cold all the time. I could still move them ok but the lack of feeling meant that I couldn't do some simple things like tieing my shoelaces.
Anyway, eventually I had the op to relieve the pressure on the nerves, which I believe is the same op carpal tunnel sufferes have.
They told me some long time like 10-12 weeks to recover but I was back at work after 4 weeks and had full use of my hand after 6 or so weeks.
There's never going to be a good time for you to have 10 weeks off work, is there? The sooner you get it done the sooner you'll have the full use of your hand back.
Good luck mate