I'm getting closer to the 7500 mile maintenance interval. The manual says to replace the spark plugs and air cleaner. I read through the manual. This looks pretty involved. I've had the fairings off a few times but never dug down into the engine. Anyone do this yet and what was the level of difficulty? Is this something best left to the dealer? I've taken tanks off my other bikes, but this looks a little more involved than the bikes I had in the past.