Re: Spark plugs
The hardest part of changing plugs on a TS is getting them out! They can be very tight, probably due to chemical reaction with the aluminium head. Great care should be taken not to physically break them, otherwise it's probably a 'head off' job.
Getting at them in the first place is a bit involved, but not difficult. Remove the oil filler cap and the 'cam cover' (it isn't really a cam cover, but I'll call it that for convenience) by undoing the torx-headed setscrews (they will remain captive in the cover). Undo the wiring loom from the plastic clips and gently pull it clear. Remove the 3 (I think) screws which secure the coil pack plate, then pull the plate and its 8 plug caps away from the plugs. Because of the seals on the plugs, this can be quite tight, and needs a good 'wiggle' to get it to come away.
Now you can see the plugs. When replacing plugs, I like to smear a little copperslip grease around the threads as this will make things easier in 60,000 miles time!
Replacement is the opposite of removal, but don't forget to secure the wiring loom back into its clips.
Incidentally, whilst the cam cover is removed, you can give it a good scrub. Makes the engine look like new again.