Yes, once. Now I have tho replace another two touchscreens!
Well... a little difficult for me the first time.
I only follow this guy: http://www.youtube.com/watch?v=hTRXSMQ-G...
... and the big problem was to get som kind of thin double tape or glue to stick the new screen...
Nex time, I will follow (also) your N1 teardown: