Just thought I'd share for continuing readers, installed my spoiler yesterday myself (2013 impreza sport), I debated for a bit if I should do it myself but decided that it couldn't be that bad. It ended up being super easy, total time was about 30min, holes drilled smoothly enough and everything cleaned up nicely. One thing to be careful about, I stripped the bolts and nuts on a few of the mounts and ended up having to go to the hardware store and retro fit some new hardware
Looks great though!!