What a big job! And way more expensive than I expected. My stairs are definitely not perfect but now that they are done they look awesome. And I also laid ceramic tile on the landing and it is beautiful. I can tell you that I did pull up all the old treads and some of the risers (we had to leave some of the old risers on to make the stairs the same width). I probably should have ripped up the stringers and all but being a single mom without any home repair experience I was not even going to attempt that. If you have any questions I might be able to help you out some but I don't know anything about codes and stuff. I just took up the old and laid the new and did the best I could with what I had. I know that my stairs are not all the exact same length but they sure do look it! : ) Best of luck to you. They will look fantastic when you are done!