1 - 3 heures
Boss sat on his VZW iPhone4, destroyed the screen
Used iFixit VZW teardown and it went well. One of the slides was out of order, but I figured it out when the images didn't match the work. Probably the most nerve-wracking teardown I've done. Way harder than all previous iPhones.
The battery glue required more force than I was comfortable applying, perhaps using a hair-dryer on the back of the case briefly, pre-pull? Also, The iPhone liberation kit should be a mandatory pack-in or add-on.
I didn't even think to check the screws when I bought the screen. I hadn't ever seen pentalobe on an iPhone before. All other iPhones I've worked on were #00 phillips.
Perhaps a giant disclaimer or an opt-out to make people really examine the screws. I could have saved $8~ in shipping. No big deal, just a thought.