It is best if you replace the whole part shown in this picture:
https://wiki.mobileread.com/images/f/fe/223906840.jpg
because the front plastics are glued to the glass of the display, removing the front panel is difficult and may cause glass breakage.
Note that you can only do this if the new display is also 1st generation, 2nd generation will not fit.
Also, the display properties will be wrong (wrong waveform and Vcom setting), so the new display may show a lot of ghosting...
good luck