Since you have an '04 it would extremely difficult to screw up the install on S1 - there are a handful of bolts that hold it down, and 4 color coded electrical connections that plug into it. If you've never wielded a wrench in your life you can install S1 on an '04 in about 30 minutes. If you have held a wrench you can probably do it in 15 minutes.
The real critical part comes when doing the auto tranny quick learn procedure. It's very straightforward, just a series of part throttle acceleration runs outlined in the instructions. If you don't do it, you'll eat your tranny.
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