Just changed my plugs. Thanks to TXStig and this:
http://www.amazon.com/Division-DM-E9.../dp/B00J9P0TYE
it made the job significantly easier. I did not need to remove the plenum. The back two holes can be a little tricky, but not too bad. Probably had about 1.5 hours total doing it. I also cleaned everything in the process. Car is running a good bit smoother now.