Why can't I get the metal spudger between frontpanel and the rear?

Hi,

I need to replace the front panel of my Ipad. My wife dropped the IPAD and the glass cover is completely shattered, but the IPAD is still operational.

I got all the necessary specialised tools and components, downloaded your repair guide and watched the video for this specific repair job.

I can't get the metal spudger (sold to me as the original IPAD opening tool) between frontpanel and the rear casing without damaging the rear casing.

Obviously I must be doing something wrong.

Please advise.