Step #1: remove that plastic box on the passenger fender that the harness runs through. Rip it out, throw it away. Wrap the harness in some heat-reflective foil loom instead. Use a christmas-tree zip tie to secure it back to the fender when you're all done.
Step #2: tie the SC coolant lines + reservoir up out of the way--I just use a bungee cord to hold it up.
Step #3: coil packs and plugs--with those two obstacles gone, you can do them without too much trouble.
With the passenger harness freed from that plastic box to be moved around, even though the passenger side coils are a still tight squeeze they become manageable.
On the driver side you have to dodge the AC lines, but they are flexible enough you can still maneuver around.
Just have a variety of extensions, swivels, and use an electric ratchet. Zip zip.