As far as the screws, it was actually tekseven that broke 2 screws off in his n900. Also someone here sent their n900 off for repair and it came back with broken screws.

And the videos, I don't. Another guy on youtube took it apart to reach the video light and video taped it.

The n900 service manual is in the wiki.

What's the reason you need to replace your screen? If it's broken you are better off sending it to nokia I think. Unless you scratched it and just want a new, your only choice is to do it yourself or live with it.