Wish there was a better picture of the lock mechanism for the home ribbon. I ended up pushing it with a spudger as illustrated by the green arrows and broke the swinging lock mechanism! The lock mechanism is tiny and swings back and forth! Don't push on it with a spudger, open it with tweezers!!! Not sure if I can properly secure the home button ribbon now. Sucks

Just finished the digitizer replacement by buying a new one for $10 rather than pay $120 to get it repaired. Everything works great! A few tips that weren't mentioned:
1) I used a hair dryer on low heat for 30-40 secs and it softened the adhesive enough to pry it open.
2) If you have the wifi iPad (non-cellular), you don't have to worry about the antenna when prying, as it doesn't have one.
3) Be sure to remove the old adhesive by pulling it off the iPad frame so your new digitizer can sit tight and flush. Most new digitizers have adhesive included (very convenient), just peel off the blue cover vinyl as your final step.
4) Try to use something to cover the LCD screen from fingerprints and dust. I had to use a wet wipe to gently wipe down the LCD. I couldn't get every smudge off but it proved not to matter as it was not noticeable upon completion.

Hope this helps!