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I also had an issue with the logic board installation as the above comment mentioned. I found easiest way is to just remove the speaker that you just re-installed. It's 1 screw - take that speaker out and now that wire that was bumping logic board is out of the way, and just then re-install the speaker.
Just completed the upper case replacement today due to a failed keyboard and also a failed touch pad (due to liquid damage). Took a few hours to take it apart (and be careful as I was doing it) found hardest part was keeping track of screws and parts. I ended up using plastic red/white Solo cups with the Step # written on each cup (so you don't confuse the screws per step). Undoing the retaining clips for ribbon wires was hardest part highly recommend using a spudger with a fine tip as these are very tiny parts.