Your description of where you are is quite normal for three weeks post op. The sounds are normal as the pains that seem to be in different places day to day. The swelling can last up to 12 months to some degree or another, Don't worry the OS won't have any problem taking the staples out. They've done it before. I had mine out between 2 and 3 weeks with my second surgery and other than some quick stings I survived it OK without having taken any pain meds, (I did let out an occasional OW though). If I got through my first surgery staple removal (where the OS also guess OVER the staples you will do fine).
I went to outpatient PT to just go somewhere and be around other people since I live alone. You have to make sure that you are able to let them know your limits. No one touches your leg ever, don't do squats or steps or weights for the first 3 months.