It did work for me. Make sure, you have unlocked the blue switches in step 3 (sorry, had to mention that). if you can't get a grip, you might try to lay a ruler or two credit cards on top of each other on a table that is tight at the wall,
- place the ruler/credit cards on the table and just attaching the wall
- place the PF2 with the display upside down on the table in front of the ruler/credit cards with the blue switches towards you and the headphone plug attaching the ruler/cards.
- then gently but with increasing force push your two thumbs towards the top of the main FP2 unit (or use more fingers to push both in the centre as well as on the two edges). make sure you push horizontally and that the ruler is not higher than the border of the display unit (1.5-2 mm).
(hope i could explain myself in and understandable way! ;-) )