before adding the new adhesive, make good and sure the old stuff has been removed. i used the leaf shaped end of the metal spudger and also a q-tip with rubbing alcohol (isopropyl alcohol) along the edges where the glue was difficult to remove without damaging the very thin rails of the frame assembly. the alcohol seemed to soften and dissolve the glue for easier clean up.

additionally, i trimmed the die-cut double sided tape so that instead of fitting the area /exactly/ i snipped off a sliver at the ends and "top" to make the tape smaller and easier to place -- also so the tape wouldnt roll against the rubber bezel or show beyond the blacked out area of the glass (when applied to the adhesive).

the heat gun step took me the longest, but i actually used a hair dryer. i had to get the assembly quite hot before it would budge at all -- hotter than i could comfortably handle with my bare fingers. i set the entire thing on my jeans-protected thigh while heating the assembly's edges, then trying to pry, then heating, then attempting to pry again.

i seemed to find a bit more success heating from the glass side (the front side) than from the back with all the electronics and whatnot in the way.

i might recommend safety glasses here at this step because when the adhesive gave, it gave quickly and i ended up spreading quite a few very tiny pieces of my broken screen glass everywhere.

Quote from Bespin:

Hello everyone -- what kind of adjustments, if any, can be made in this step to ensure that the display sits flush with the bezel around all edges when installed? On my iphone, the display is a tiny bit uneven when installed, i.e. the glass is ever so slightly higher than the bezel on the left side, while the glass it just a hair bit lower than the bezel on the right side. Thanks!

i had to spend quite a bit of time (30 minutes) on the hair dryer/heat up step to gently heat then gently loosen the adhesive holding the front glass to the rather fragile frame.

after successfully removing the glass (and shards of glass from my broken screen) i also had some clean up to do to remove the excess glue and adhesive from both the top and bottom sections and also the rails. i used the "leaf" end of the metal spudger (not the oar shaped end) for awhile scraping up stray bits but also used a Q-tip dipped in some isopropyl ("rubbing") alcohol which helped dissolve some of the goo left in the corners and the crevices of the rails.

perhaps your screen sits a bit akimbo because you still have some goo in those rails?