Barry,
I had the same surgery. The next day a person from physical therpy in my room and got me up to walk. I had to put weight on the leg that had the bone removal, but I was warned to walk on it as though I was walking on crackers and didn't want to break them. That went on for two days and then it was determined that I was doing fine and I could put more weight on that leg. After five days I was walking normal, but slowly. As far as the jaw being rebuilt after three weeks I got used to the different feeling. The worst is having no feeling where the jaw bone was replaced. If you are eating and some food drops outside your mouth, you have no idea it is there. I found by being up front and telling people who are sitting at the table that you have no feeling in a certain area and would they please tell you if some food is there, you have no problem. People are very helpful.
At first I had lots of Carnation Instant breakfast, milkshakes, jello etc. ,but now I eat everything that I can cut up. I have no teeth in the area where my jaw was replaced, and I choose not to have inplants as I have doubts about the pretreatment prior to inplants. I have gained weight and am back to normal, with the expection of no feeling in that certain area. Good luck and with a positive attitude you will be just fine.

Hacklene