I did it! Replaced the trackpad after the MacBook Air took a dive from a stand, which fortunately just shattered the trackpad's glass. Thanks for the easy to use instructions!
Just one note on step 8: I had to use a PH000 (triple 0) instead of the double 0 - almost destroyed one of the screws before realising.
Just to let anyone wondering know: today I replaced the HDD with a 60 GB SSD - works like a charm. Maybe I can use this pod for another 8 years! :-)