it is normal to be nervous - for all my "experience" I am still nervous about the operation. Until they go in and actually see what the problem is they are never sure what is required. for example I went in for a replacement ACL and had a lateral release notch enlargement and debridement because once inside they saw that the problem was not a torn or non-functioning ACL - it just did not have room to function and the cartilaginous structures were so "hairy" they were giving false information on the MRI.
I give them Carte Blanc to do whatever is necessary because I trust them. I have never come out of surgery to a worsened situation, once or twice a changed one though
. I insist on having a CPM as soon as possible as this movement does help me not to build up scar tissue - the one time I did not have a CPM I had scar tissue issues and needed a MUA to excise it and get the knee going. since I've been in Germany I have noticed that the practice of leaving drains in the wound site for 24 to 48 hours has help reduce the length of time I have problems with post-op swelling. Coupled with the Lymph Drainage massage this seems to work for me.
Rehab after repairs are harder than rehabs after trims because of weight bearing issues. I had one trim here - day surgery, I went to my GP 48 hours later and he removed the drains. Three weeks later I was skiing and a month later I was back teaching skiing, 8 hours a day on skis working with all levels of clients. So it is not always the end of the world. I tend to take things as they come - if it delays the inevitable TKRs a bit longer then I'm OK with it.
hope this helps