You can use a following trick to remove the original protector film:

1. Take some low-tack tape (masking tape is good).
2. Smooth a piece of it, 6cm or so, diagonally at a corner so that half of it is hanging loose outside the screen area while the other 3cm is firmly attached to the film.
3. Grab the loose end and pull quickly towards the center of the screen. For those of you unfortunate enough to have waxed of hair, this movement should come quite naturally.
4. Throw away the useless film and enjoy your N800

This method is somewhat safer than trying to pry the film loose with your fingernails.