Well, did my first spark plug change on my 08 JK Wrangler w/ 62,500 miles. After reading all the post on this an other forums, I was hesitant, but went for it anyway. So anyway, here are the tricks and lessons learned from a successful change. BLUF: No problem.
First of all I did all 6 plugs in less than an hour. Wed morning, cold engine. I believe the engine being cold was critical for the success. Each plug came out easily with a 3/8 drive ratchet and 3/4 spark plug socket, 3in extension and 3/8 swivel joint. I started with the notorious #5 plug.
Folded the hood all the way back onto the windshield (this gave lots of room to work), stood on the bumper, placed my right hand on the top of the engine cover and reached under the hoses with my left. Plug came right out. New plug went in without a hitch. Repeated the procedure all the way around. The worst problem was with the sweat dripping down onto my glasses. Be patient, use never-seize, and di-electric grease on the new plugs. As I said, all 6 plugs in less than an hour + clean up.
As for the many questions I've seen on spark plug gap. I used the OEM recommended Champion plug #RE14PLP5 and gapped them to .050 per page 425 of the owners manual.
BTW: Also did break pads on all four wheel this morning as well. these breaks are really simple and did all four wheels in 2 hours including setup and clean up before moving onto the plugs.
All's well and ya'll stay safe