Hi Paco
Don't worry, the IR surgery on a D80 is easy. Just follow the indications on Lifepixel's site and you should be fine.
Things you should pay attention to:
1. if the camera doesn't work when you assemble it, it is most likely a flat & flexible connector that was not properly inserted.
2. Dust is your enemy! How many times did I have to start over?
3. Make sure you have the appropriate screw driver. You don't want to destry the scrw head and yet be unable to remove it...
4. Be quiet, work in a well lit place, no wine before you start...
Of course, it all happened to me!
Olivier
Edit: brent_e said it all and very well (I started typing my message long before I hit the post button).