As for removing the part.
heat the bed to about 80c and use a VERY thin metal tool - I use wallpaper scrapers that I've sanded the edges smooth.
Get the really really cheap ones from pound or buck stores. The thinner and cheaper the better :-)
And use a sanding block to remave the sharp edges, otherwise the can easily gouge the print bed surface.

and work it under one corner, once you've got any part of the stuck print lifted the rest is always much easier to peel off.

what printer do you have ?