I stripped one of the 12 screws. Of course one of the ones attached to the unibody frame not the trackpad. I thought I could weasel the trackpad out without taking the right bracket off but no dice. I had to bend the bracket and turn it around to get the trackpad out.
After I got the trackpad out I took out the replacement (purchased from here) and lo and behold it had the two brackets attached! So great, I'm good on screw count! But crap, now I REALLY need to get that stripped screw back out.
Thankfully I was able to dig it out with a tiny flat head bit from the 54 bit driver kit.
I even reattached the two brackets to the old trackpad and put it back in the ESD bag. I wonder if I can send it back to iFixIt to be refurbished. Don't want to toss it and have it wind up in a landfill unnecessarily!
Guide is spot on. I only ran into some difficulty on Step 8. (More details below) Was eventually able to replace trackpad with replacement purchased from here. No more phantom clicks! Although examining the old trackpad and the click "button" makes me wonder if I could have fixed the old one by tweaking the set screw... Regardless, MBA now fully functional again! Wasn't easy but this guide made it not hard to do!
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