Only half of my MacBook Airs trackpad would click, and I am not a tap to click sort of person
The repair took about 10 minutes. After getting the pentalobe screwdriver, I removed the bottom case and the battery shield. I determined that the dust had to be under the piece of metal that holds the trackpad in place. Using a bent paper clip, I was able to clear out the offending object.
Be careful when clearing out the dust. You don't want to scratch the bottom of the multitouch surface. In addition, keep a careful watch on the MBA screws. They are very tiny and easily lost.