Shoulder replacement experiences?

[MS Fowler]

I am 4 weeks away from a reverse shoulder replacement. Bone-on-bone and it clicks and jumps--so its due.
I expect to loose the month of February, recovering---besides its too cold in the shop then, anyway.
A few years ago, I had both knees replaced at the same time--I know it was painful, but the meds reduced/ eliminated the memory of the pain...along with a few other things.
Anyone give me an idea of what to expect?