Why such a small battery? Weight or just space? I think they could have (and may well one day) double the size of the battery and double the battery life. Ten hours on a charge would be awesome.
5. The grounding tab (triangular shape metal piece sticking out from the mother board that grounds the phone to the case looks very fragile and gets caught up in the cable. Be careful with this.
6. As mentioned, I couldn't get the suction cup to work, pulling off the screen. Perhaps would be easier using an iFixit suction cup. Mine was an old one from around the house and not as sturdy or strong.
7. Spluder is excellent, so glad I got that.
8. Getting the battery off was quite difficult. I highly recommend heating the back of the phone for a while (it takes a while for the glue to soften as well). Be careful when prying the battery off as there are some ribbon wires and other bits around the battery.
9. Highly recommend the fridge magnet and a magnetic screw-driver for handling the screws. They are very small and jump about very easily when knocked or dropped. Also you do need the correct screw-driver, won't work with larger ones.
Thanks to all the other comments as well.
Great guide, thank you.
Things I found:
1. Putting connectors back on was easier with my thumb because I could feel very clearly when it was in the right position and push softly across the surface. All connectors seemed to click back in place, except 1-3.
2. I had a lot of trouble getting the screen off (perhaps because the phone is so old). I eventually had to use a "hooked screwdriver" on the edge of the glass at the button-end. It came out quite easily but be careful not to damage seal around class.
3. I used some of the old battery adhesive tape to cover the screw under the "Do Not Remove" sticker, which was impossible to flip back without destroying at least half of it. I think it should be ok this way.
4. I dropped a screw into the phone when re-assembling and took a long time to find it. Be careful, the screws can fit in little spots and become fixed without even screwing. I finally found it, looked like it was a permanent screw but splutter could move.