4s is very similar, just a couple more little shields. Be a bit more gentle on one of the early steps removing the battery connector. They seem not to be soldered on as well as the 4 and if pulled to hard, can yank it off the logic board and you're screwed. Not to worry, just be gentle, don't do a "hard flick" motion, but a gentle lift. Always kind of use your thumb or other hand as kind of a "door stop" to your motion so you can't go too far with a movement, if you know what I mean. When you're doing an action, you don't want a scenario where it suddenly "gives" and your momentum causes a big movement and something tears. (Causing another big movement)
Taking cables off the logic board, you can use spudger, just be careful to just get under the cable, don't use the logic board as leverage. If you have a good thumbnail, you can use that as well which is sometimes easier to be careful.
If the cable gets crimped, it just won't be long enough to plug into the board, but if you screw on the LCD / Digitizer with it crimped, you can easily damage the cable.
There are one or two little plastic pieces that might come off that need to go back on. The main one that happens is a little protective piece of plastic that sits on the logic board at the top and protects the LCD/Digitizer cable from rubbing against the logic board. In the photo below, its hard to see, but it's sitting right at the edge of the logic board, right on top of the white barcode. Little piece protects LCD and digitizer cable as it wraps around and connects to logic board. Falls out a lot as your taking out.
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The 6 screws along the sides, don't take them completely out. Just do 3 turns (Not complete circles, but 3 regular turns of your wrist). A lot easier to do than trying to re-insert with tiny little washers.