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Just a follow-up to increase the knowledge base here:
1- I replaced some plugs with a very slightly warm engine, and some with the engine stone cold. All went fine, and no real difference.
2- I used the GearWrench 5/8" Swivel Spark Plug Socket with magnetic insert as recommended by others on this forum. You can get it cheap on Amazon
3- Even with the swivel socket, you will need various extensions with universal joints or wobble adapters to work around the exhaust components. I've never had good experiences with universal joints, and I don't trust torque wrench values put through a universal joint, so I used the wobble extensions pictured below that are also available cheap on Amazon. I think the more gentle radius of the wobble extensions vs. a universal joint should give more accurate torque values, but it's still best to keep everything as straight as possible when measuring torque.
4- It's a pretty easy job, and Porsche did a great job of designing in accessibility given the engine location. I don't know why anyone would ever pay the exorbitant dealer costs for this.