It's kind of hard to see which pieces are being separated in these photos. I found it helpful to separate the sides first (shown in step 16) by pressing outward on the glass while holding the metal edge. This allows you to see what you're separating and makes it easier to separate the top and the bottom.
You probably want to avoid scraping off the rubber coating around the edge.
Gloves and eye protection are a really good idea for the next few steps. You want to keep from getting glass splinters or burnt fingers. Maybe I'm not as talented as the ifixit guys, but heat guns and separating things with my fingernails just don't mix well for me. I used a pair of very sharp tweezers.
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