My husband had his knees replaced 13 years ago and was off his feet for a few days and then on crutches for 6 weeks.
The pain was minimal and, yes, you do have to do the exercises.
Nowadays, in our area, they use an epidural and you stay awake.
A friend has had hers done like this and thought it fabulous.
No vomiting afterwards which often happens with an anaesthetic.
My husband had all the joints on his toes done this way a few months ago and was thrilled!
Good luck!
GG
X