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Lay across the engine, feet toward driver's side, and the #8 plug is easy to start. Or (this sounds silly but it works too) stand with you back against the car on the passenger's side and you hand angle will be perfect to start it. I have big hands too and had no problem.
The first time I did a plug change I spent over 4 hours trying to start the #8 until I discovered the back against the car trick. Now I can change all the plugs in less than 2 hours working at a slow pace.
There is no need to take anything apart to do this.
I think that it maby has a few stripped threads and its not the plug at all. He has tried all the things that work but can't get the plug to thread (from underneath, remove the wheel wells, use a rubber hose to thread the plug etc.)
I think he needs his next move if the threads are stripped.(heil-coil, thread chaser etc.)
An update. I managed to get a tap started in #8. The tap was too long to come at the side through the wheel well with a U joint so I had to do it laying across the engine. I couldn't get more than the tip of one finger and back of another on the tap, so it was slow going, but I got it to turn about 3 times with no resisitance, so I know the threads are fine as they appear.
Unfortunately, when I treid to get the plug started again, I dropped it. That's now 4 of them in the trash. Urrrggghhhh!
I have another 4 on order, hopefully they'll come in today and I can try again. I now have a bore scope wire tied in place so I can see the hole and the angle of approach when I have my hand in there. If I can just get another plug lined up on that hole without dropping it again maybe I can get this SOB started. If I do, I'll never go near that plug again with wrench in hand.