I had an operation for Duputren's contracture on my right hand just before lockdown this year, and the type of bandaging used to immobilise my hand after surgery looks similar to what is used after carpal tunnel surgery (i.e. a stiff bandage with not much more than the top joint of the fingers showing, although yours will no doubt extend further along your wrist than mine did.)
Without going into too much detail

I did practise doing essential daily tasks left handed before the op - people will obviously vary as to how much potential they have for opposite-handedness, but practising will definitely make the most of whatever you have.
Best tip for bathing and washing up activities is to have a supply of freezer bags of appropriate size to cover the bandage with a bit to spare, and elastic bands to secure them (when I say 'them', I mean use two - I didn't and got a puncture!

)
Got by OK, and the bandage did become a bit less tight towards the end of the two weeks which gave a little more movement in my fingers, but oh boy, was I glad to get the damned thing off?!

Good luck!
