Would you opt for an operation that has less than a 50/50 chance at being successful?

I have a torn rotator cuff, and have been off work since late November.
Have been doing physio and have all my rotation back, just a bit sore in a few directions.
My Doctor, and the specialist say I can not return to my job for another six months.
My Boss has offered a lighter haul, only 8 hours a day with almost no physical work, instead of my run of 14 hours a day and lots of work.
I might according to the Doctor be able to just live with it, and in 6 months be able to return to my job.
I’m kinda leaning to the lighter haul and see in 6 months, or do you think it’s a better idea to chance the operation?
I should add the Doctor is OK with me trying the lighter haul.