Hi Marie...
I have not had my sleeve yet...but...I had both my knees replaced (total) in 2009 and had to have my left on revised in Aug. of 2011 cuz the tibial portioned failed. Anyway...I have had 7 surgeries since 2009 and the knees, quite honestly, were the easiest of all!
Now, don't get me wrong.....it is uncomfortable especially the first few days, but depending on where you are at now, as far as pain goes it is so much better! What I mean is, the pain that I had before I had them replaced was so unbearable for soooo long that the surgery....well...it was a breeze in comparison.
You will do just fine and make sure that you get started on PT immediately.....Oh! and this is huge..huge...huge!!! HAVE THEM PUT YOU ON THE CPM (continuous passive motion) MACHINE IN RECOVERY....no matter how crappy you feel--get on that sucker right at the get go....it will make all the difference in the world to your range of motion for the future. Once that scar tissue forms, and it happens fast, well...you don't want your knee to have limited bending capability is all I'm sayin.
Finally,
And this is big too....
Make sure that they order you a polar ice machine....AND TAKE IT HOME WITH YOU...IT'S YOURS!!!
That machine will be your saving grace through recovery, after physical therapy..etc....it is awesome. If your doctor did not mention these two machines to you as of yet....get on the phone with him/her tomorrow and tell them you want an order for them so that they are there for you at the hospital....INSIST ON IT.
You will do great and you will be so glad you had it done.....you will have moments that suck big time...but it is worth it....