BECAREFUL twisting the spudger. You need to be right on the clip. If you are too far away from the clip you will crack the LCD screen from the inside (happened to me and ended up having to buy a new screen). I found a video where it shows working one of the picks all the way around the screen first to separate the glue / sealant that is used FIRST. then you can locate the clips easier Prying after all the glue is worked loose make it sperate a lot easier.
HINT - The clip on the button side is not in the middle of the side it is slightly higher towards the Power button. The left side (no buttons) the clip is directly in the middle of the side.
I agree with the heat gun. Only needed to use it on low for a few seconds. iOpener did not work, ended up using an exacto knife and heat gun after breaking the bottom glass. Found the replacement glass on Amazon for 6.99 for both pieces.