I have to do something similar to change plugs in our Mazda Tribute with a V-6. The alternator is worse, the book started out with remove tire and separate lower control arm from spindle. After that, the contortionist is called in!!

Nissans are notoriously hard to change plugs in.  I did a set in my buddy's Pathfinder back in the day.  The rearmost plug I think I used two u-joints and two extension to get to it. 

Go to the dealership and let them fix it?  Poop to that!  I've forgotten more about cars than they'll ever know.  Everything changes so fast now that they never really learn how to fix one model before a new one comes along.  Plus, most of them if the scanner can't pinpoint the problem; good luck.

No, actually, this is exactly like when cars first started having EFI.  Everyone said, this is the end of hot rodding, no one will ever be able to figure these engines out.  In fact it was the exact opposite.  Hot rodding exploded again and cars make more power now than ever before.

When it comes to fixing it, remember, all the knowledge in the world is literally at your finger tips.  The ability to diagnose and repair newer vehicles is just a Youtube video away.  If anything its getting more people to try fixing their own stuff instead of dropping $100/hour at the stealership.