Great guide - took me about 25 minutes to replace my trackpad. I didn't follow step 13 as I simply kept the existing Y1 tri-point screw in place without any adjustment and the click felt fine. Routing the cable through the slot in step 14 requires a little care to avoid damage but isn't too tricky. At step 15, I noted that my trackpad was well aligned, so I replaced and fully tightened all of the screws and skipped steps 16 onwards, simply re-assembling all the other components in the order I took them out.
Immediately after step 12, it is possible to replace the two brackets that secure the upper edge of the trackpad in the top case of the MacBook (from which the six 1.4 mm Y0 tri-point screws were removed in step 10). My replacement trackpad was supplied with spare brackets, so I was able to replace one that was bent out of shape.