One way to do it :
1. Get hold of a piece of sticky tape (Scotch Tape, Sellotape, etc). A 3 cm piece would do.
2. Stick about 1 cm of the tape on the screen protector, diagonally, at one of the four corners of the screen.
3. Make sure that the tape really stick to screen protector, at the selected corner.
4. Put the PDA on a horizontal surface.
5. Hold the PDA on the surface with one hand.
6. Use the other hand to pull the balance 2 cm sticky tape vertically up.
7. The screen protector should start to peel off the PDA screen, starting from the selected taped corner.
8. Continue peeling the screen protector until it completely detach from the screen.